Probably like most guys in the U.S., my husband has a lot of t-shirts. They take up three drawers of his dresser and are crammed in around the shorts, swim trunks, a few sweatshirts and some blue jeans.
I don't know why I never thought of this before, but it occurred to me that I should roll his t-shirts like I would if I were packing a suitcase to save room. It worked great! There's now two layers 0f t-shirts and swim trunks in this drawer. Another, larger drawer has three layers of rolled t-shirts along with some shorts. The bottom drawer has a few pairs of shorts and a lot of empty space!
Anything bulky, like sweatshirts, got hung on his side of the closet. I found a few things to add to the donation pile.