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You know, before, I thought all cottons were the same until I bought a really good organic cotton t-shirt in Portugal. It turned out to be as breathable and odor-resistant as my merino wool t-shirt. Since then, I’ve researched how to find and recognize high-quality cotton, and I inevitably came across the famous “Sea Island Cotton”—the best in the world, rare, precious, and a true connoisseur’s cotton.
According to the West Indian Sea Island Cotton Association (WISICA): “Sea Island Cotton is only found in the British West Indies, where the Caribbean climate is ideal for its cultivation. The fibers are handpicked and processed using traditional methods, resulting in an unparalleled softness and silky texture. With an average fiber length of 50mm, its fibers are 20% longer than other fine cotton varieties. Out of the approximately 110 million bales of cotton produced worldwide each year, around 2 million bales (1.8%) belong to the long or extra-long staple cotton varieties (35mm and above). Of this total, annual Sea Island Cotton production amounts to only 130 bales. It is simply the rarest cotton in the world. A special hologram issued by the West Indian Sea Island Cotton Association (WISICA) is usually included with Sea Island Cotton products to guarantee authenticity.”
However, according to my book: Fabric for Fashion: The Complete Guide Second Edition (English Edition) (p. 178). Quercus. Kindle Edition by Hallett, Clive; Johnston, Amanda. “The term ‘Sea Island’ applies only to extra-long staple cotton. However, unlike Egyptian cotton, it does not refer to the species Gossypium hirsutum, but only to Gossypium barbadense, also known as Pima cotton and Creole cotton. This species grows as a small bush, requiring full sun, high humidity, and significant rainfall; it is also frost-sensitive. The plant has natural antifungal properties due to the presence of the chemical gossypol, making it naturally insect-repellent and an ideal candidate for organic cotton. The fibers are particularly long and silky. Today, this species is widely cultivated in many countries, although its pedigree traces back to Peru before the Spanish conquest, and then to the West Indies. Barbados was the first British colony to export cotton and may be the origin of the name. While Egyptian cotton evokes an image of luxurious fabric, Sea Island Cotton applies to fine, luxurious knits.”
I read a few online reviews, and everyone agrees: it’s as soft as silk, and you should NEVER tumble dry, or else the t-shirt will shrink.
This isn’t a problem for my current t-shirts, so I think owning a Sea Island t-shirt just requires a little extra care when drying. If I were still traveling the world, dropping off my laundry at random dry cleaners for $1/kg, I definitely wouldn’t have bought Sea Island Cotton. But now that we’re settled again, I can better manage my laundry and take proper care of it. That also means that if you ever buy this kind of t-shirt second-hand, you need to make sure the fabric hasn’t shrunk.
On the WISICA website, there’s a list of brands using 100% certified Sea Island Cotton:
Brioni
Sunspel
Niccolò P.
John Smedley
Tom Ford
Orlebar Brown
Visvim
Turnbull & Asser
Derek Rose
Apposta
Hanro
For my first Sea Island t-shirt, I chose the brand Sunspel. Sunspel is an iconic British brand. Initially, the company focused on fine cotton underwear to provide superior comfort in an era when wool dominated. Sunspel became one of the first companies to introduce ultra-soft cotton fabrics and helped popularize the concept of comfortable t-shirts and underwear for everyday wear. When Daniel Craig wore a Sunspel polo in Casino Royale (2006), made from a fabric particularly suited to the heat of the French Riviera, it cemented the brand’s sophisticated and minimalist image. The secret of the Riviera polo? A design tailored to Daniel Craig’s exact measurements—refining the chest fit and slightly shortening the sleeves to highlight his physique and allow free movement in action scenes. But even James Bond doesn’t get Sea Island Cotton. It’s a separate collection.
I paid €105 for this simple Sea Island Cotton t-shirt instead of €175. With shipping (via DHL), that added €5, so the total is €110. DHL delivery is very convenient because you can schedule the delivery or redirect it to a nearby pickup point. Even though Sunspel is a British brand, they have a European website where products are shipped from Germany, saving me from paying customs fees. Phew.
However, to maintain a reasonable price, the t-shirt is not manufactured in the UK but in Portugal. And I don’t know where the fabric is woven (it’s not specified on their website, unlike other fibers). The product description states: “The extra-long fiber, fine and uniform texture, silky sheen, and high strength of the cotton allow it to be woven to the highest thread count—a highly skilled process that only a few weavers in the world know.” Well, which weaver do you use? How many threads per cm²? How many grams per meter? This lack of transparency is disappointing.
The t-shirt itself isn’t a difficult product to manufacture, so spending €100 on a t-shirt hurts. Especially since I read in this article (source): “I can buy Sea Island Cotton t-shirts for €6.50 ($7.65) from a local manufacturer, and that’s without the economies of scale big brands benefit from,” says an independent designer who has been producing his own line in the Veneto region of northern Italy for decades (and who wished to remain anonymous). “I imagine big brands can have them made for as little as €3.50 ($4.15).”
While researching, I found Petit Bateau Sea Island Cotton t-shirts released a few years ago for €79. A few clicks later, I bought the same one in “very good condition” from a seller on Vinted for €10 + shipping. If Petit Bateau can make it in France for €79, taxes included, I imagine Sunspel’s €175 price tag (made in Portugal) ensures them a comfortable margin.
But is the quality the same? To find out, let’s compare the two brands. From Sunspel, I have a size XS t-shirt, and from Petit Bateau, I have a size M t-shirt. My actual size is S, but I can wear one size up or down depending on my desired look.
Complete References
- Sunspel: Sea Island Cotton T-shirt, size XS
- Petit Bateau: Women’s Sea Island Cotton T-shirt, size M
Composition
- Sunspel: 100% Sea Island Cotton
- Petit Bateau: 100% Sea Island Cotton
Texture
- Sunspel: The texture is incredibly special, unlike anything I’ve ever felt before. It’s somewhat like fleece but much smoother, silkier, lighter, and thinner. It’s warm, airy, and very soft. There’s a wool-like feel to it, as if you’re wrapped in a small cotton cloud.
- Petit Bateau: The texture is surprising. It feels like a cotton & silk blend, but even better, as it has a lightness that other cotton-silk blends lack. It’s fresh, airy, and very soft.
The weave of the Petit Bateau fabric seems tighter. I didn’t count the threads, but it appears to have a higher thread count per cm². Sunspel has more elasticity, whereas Petit Bateau is less stretchy.
Transparency
- Sunspel: I have a navy blue t-shirt, almost black, and it is not see-through at all. Impressive for such a thin fabric. I’m not sure how this would be with a white version.
- Petit Bateau: I have a black t-shirt, but I can still slightly see my fingers underneath. I’m glad I didn’t choose a lighter color because it would have been too transparent, in my opinion.
Stitching
- Sunspel: Standard stitching, with a topstitch at the collar, nothing extraordinary. A few loose threads here and there.
- Petit Bateau: Standard stitching, with a topstitch at the collar, nothing extraordinary. A few loose threads here and there.
Fit
I really like the fit of both. The collar is just right (I don’t like high collars) and the length is perfect. They look great.
Conclusion
For summer, I prefer the texture of Petit Bateau, as it has a silk-like feel. It provides a refreshing sensation, making it perfect for hot weather. However, it’s a texture commonly found in cotton-silk blends. Meanwhile, in winter, Sunspel stands out—it’s incredibly comfortable for winter, warm, and enveloping, like being wrapped in a soft cotton cloud. I wear it under my cashmere cardigan. It feels like a second skin and is barely noticeable. At one point, I sweated a lot, and it behaved like wool—quickly wicking away moisture without retaining odors.
Considering value for money, I still prefer Petit Bateau. Unfortunately, their Sea Island collection was a limited and exceptional release. If you ever find one, it will likely be on Vinted and not necessarily brand-new.
Both t-shirts handle washing very well, though I treat them like cashmere (washing in a mesh bag, using a silk/wool program, and air-drying flat). In the end, I’m really happy I got both Sunspel and Petit Bateau at a discount. I’ll definitely repurchase one or the other in the future because ever since I discovered Sea Island Cotton, I no longer enjoy other cottons—including Supima cotton.
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