Choose the role before the color
A cotton T-shirt can be an underlayer, a standalone top, a sleep shirt, or a structured base for a jacket. Those uses need different weights and shapes. A thin tee may layer easily but show the outline of a bra; a heavier tee can look intentional alone and create bulk under a jacket.
Write down three outfits you expect to make with it. The neck, sleeve, and hem should support those outfits rather than force you to style around a generic “classic” shape.
Compare fabric weight and hand
Cotton weight gives a rough idea of opacity and structure, but finishing changes the hand. Ring-spun, combed, slub, and jersey descriptions point to different surfaces. Read fiber content and construction together because a soft hand at delivery can change after washing.
Check the fabric under the arm, across the chest, and near the hem. Thin white fabric is especially dependent on lighting and layering. If the tee is intended to be worn alone, evaluate opacity as seriously as softness.
Neckline recovery is a repeat-wear test
The collar is one of the first areas to show wear. Look at binding width, stitching, and shape. A ribbed collar can recover well when construction is sound, but repeated stretching and high heat still change it.
Read reviews for twisting, rippling, or stretching after washing. Those patterns are more useful than a single claim about “premium cotton.” If you prefer a wide neckline, check whether it sits deliberately during movement.
Fit the shoulders before the waist
Shoulder width and armhole shape determine how a tee hangs. If the shoulder is too narrow, the sleeve can pull; if it is broad, the tee may look relaxed or simply oversized. Compare shoulder and chest measurements with a tee that has the silhouette you want.
Hem length should work with the bottoms you wear. A cropped tee can balance a high rise but expose skin when you reach; a longer tee layers well but can bunch beneath a jacket.
Color and care change the economics
A basic tee is often bought in multiples, so small care differences compound. Confirm wash temperature, drying instructions, and likely shrinkage. Dark dyes may need separate handling at first, while pale colors show stains more clearly.
If a tee costs little but loses shape after a few washes, its real value is lower than the price suggests. Compare cost per expected wear, not cost per checkout.
Build a small test order
When trying a new brand, start with one tee rather than a full color set. Record the measurements and fabric weight, then wash it according to the label. Check collar, seams, and shrinkage before ordering more.
The best cotton T-shirt becomes boring in the useful sense: it sits correctly, layers without fuss, and survives the care you provide. Judge it after a normal day and a normal wash.