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Lightweight tees, whether fitted or not, are easier to tuck into high-waisted bottoms without causing any odd bulking. Weight matters for other reasons, however: The heavier a shirt is, the more it’s designed to wear casually over tighter bottoms.
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On the other end of the spectrum, Everlane’s organic cotton tee may be made from more heavyweight stuff, but it’s still very much suitable for mid-season dressing. Of course, a T-shirt made from a heavier fabric will tend to keep you warmer, while a lighter fabric will tend to keep you cooler, but that’s not necessarily the case: For example, our thermal pick from Uniqlo is made from fairly thin fabric, but is designed to warm you up.
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