What are some good brands for single colored shirts? H&M shirts are too flimsy (no fabric). Is uniqlo any good?(europoor here btw)
James perse, dior homme, rag & bone, margiela depending on season and if the pick stitches are appropriate for your lifestyle.
On the cheaper end John varvatos, and Elizabeth and James...yeah that Mary Kate and Ashley brand has a small but somewhat decent menswear lineup.
Then you have the street wear designers but these are shirts you'd find on like Justin bieber, Balmain, givenchy
If you are taller/broad shouldered/athletic you literally can not beat Mossimo. Amazing price, great quality and fit, I fucking swear by them.
Gildan also has some good 50/50 poly/cotton blends but I hate their regular cotton.
AA is pretty overpriced but if you don't mind that the shirts are of decent quality.