What Size T-Shirts Sell Most? Top Sellers, Sizes, and Trends in 2025

When it comes to t-shirts, a basic garment worn by nearly everyone, across ages, genders, and cultures. Also known as tee shirts, they’re the foundation of casual wardrobes worldwide. But here’s the real question: what size t-shirts sell most? It’s not the same everywhere, and it’s not just about M or L. Retail data from online stores like Trendy Threads & Treads India shows that medium, the most commonly purchased size across adult unisex t-shirts leads the pack—not because it’s the average, but because it’s the safest bet for returns, gifting, and online shopping uncertainty.

Why? Most shoppers don’t know their exact measurements. They pick medium because it fits a broad range of body types. In fact, over 40% of online t-shirt sales in India and similar markets fall into medium, followed closely by large. Small is popular with younger buyers and women’s fits, but it’s not the top seller overall. Extra-large and XXL are growing fast, especially in urban areas, thanks to rising body diversity and inclusive sizing trends. But they still trail behind the middle range. Even more telling: sizes that are too big or too small get returned more often. That’s why retailers stock more mediums and larges—they move faster and cost less to handle.

It’s not just about size. Color, fabric, and fit matter too. The best-selling t-shirt colors in 2025? Black, white, and heather gray. These neutrals pair with everything and appeal to all age groups. Cotton blends with a bit of spandex are winning over 100% cotton because they hold shape better after washes. And fit? Relaxed is beating slim. People want comfort without looking sloppy. That’s why brands are designing t-shirts with a slightly looser cut in medium and large, not just bigger measurements.

Regional differences play a role too. In metro cities, sizes run smaller—medium is often the largest size people feel comfortable buying. In smaller towns and rural areas, larger sizes sell more because body types vary more and there’s less access to tailored fits. Online shoppers in India, especially women, often size up by one size because they’re unsure of fit. That’s why many stores now include size charts with real body measurements, not just S/M/L labels.

So if you’re buying online, don’t assume your usual size. Check the brand’s chart. If you’re selling, stock more mediums and larges, offer clear measurements, and highlight stretch and fit details. The t-shirt that sells most isn’t the one with the flashiest design—it’s the one that fits right the first time.

Below, you’ll find real guides and data-backed insights on t-shirt sizing, color trends, fit mistakes, and how to pick what works for your body—no guesswork needed.