T恤 is correct. there is no same word to express T in chinese so we use the original english term and T is also an expression of shape. 恤 pronounces /xù/ which has no actual meanings here, just pronunciation similar to shirt .

it is T-恤衫

T恤衫。（tī xù shān ） 还有种民间说法叫“汗衫”（hàn shān ）。

hello, everyone, I guess he was asking what is on the T shirt. but where is the pic,

absolutely