We bought twelve plain white t-shirts between £8 and £95, wore each one four times, washed them eleven times at forty degrees, and photographed them under identical light before and after. Three held their shape. Four were acceptable. Five had gone — twisted side seams, stretched necks, or a hem that no longer sat flat.
The neck is where it dies
Failure was almost always at the collar. A well-made t-shirt has a ribbed neckband cut on the correct grain, taped across the back, and stitched with a stretch seam that can recover. A badly made one has a thin band, no tape, and a seam that stretches once and stays stretched. You can check all three in the shop in about eight seconds.
Colour changed the result more than we expected. Every white shirt in the test looked worse after eleven washes than its equivalent in navy or black, regardless of price, because greying is cumulative and irreversible in cotton. If you wear white t-shirts, expect to treat them as a shorter-life item whatever you spend.
Price predicted almost nothing. The £8 supermarket shirt outlasted two shirts at four times the money, and the £95 one came fourth. What did predict performance was fabric weight and whether the side seams were there at all: every tubular-knit shirt in the test twisted within six washes, and every one with proper side seams did not.
“A tubular t-shirt has no side seams because it is cheaper to make. It will twist. There is no exception.”
A knitwear technologist
What to buy
Look for side seams, a taped neck and a weight between 180 and 220 grams per square metre. Below 160 it will be transparent and short-lived; above 240 it becomes a different garment altogether, which some people want. Combed cotton is worth the small premium. Anything described only as "100% cotton" with no weight given is a gamble.
Washing does the rest of the work. Cold water, inside out, and a line dry will roughly double the useful life of every shirt in this test. The single most destructive thing we did was tumble drying, which shrank three shirts by more than four per cent in length and set a permanent twist in two of them.
Why they go transparent
The complaint we hear most about white t-shirts is not shape but transparency, and it is a fibre problem rather than a weight problem. A shirt knitted from short-staple cotton needs more twist to hold together, which produces a harder, thinner yarn and a fabric that lets light through at the same nominal weight as a softer, longer-staple alternative. Two shirts in our test at identical gsm behaved completely differently.
There is no way to read this from a label, which is the frustrating part. The proxies that work are combed or ring-spun cotton, a named fibre origin, and a price that reflects both. The proxy that does not work is weight alone, which is what most guides tell you to check and which we found predicted durability well and opacity barely at all.
One practical note that applies to every shirt in this test. Buy the size that fits across the shoulders and accept the body, because the shoulder seam is the one measurement that cannot be altered cheaply and the one your eye reads first. A t-shirt slightly loose through the body reads as deliberate; one whose shoulder seam sits halfway down the arm reads as wrong at any price.
The whole category is a useful reminder that construction, not price, is what you are actually buying. Our overall winner cost £24, has side seams, a taped neck and 200gsm cotton, and looks better after eleven washes than five shirts that cost more.
