Cold water has worked on my end, as well!
Truth be told, I didn’t really buy much for clothes mech over the years due to the huge difference in variety/sizes at times. But I’ve tried to make more of an effort in post-pandemic years, due to a few reasons. I’ll usually get a larger shirt and have it hemmed (if necessary), then avoid hot water or heat from the dryer, which seems to keep them in decent condition. no matter the quality.