I have a room just for my clothes.
There. See how simple it is? 
Actually it's not that simple, I have quite a few functions every year where I have to dress up. I have specific types of outfit that I have to wear for two different choirs. Each demands different outfits again for xmas and Easter concerts if held in churches. I have gardening clothes for all weathers. And a very active social life.
However, DBH has even more outfits than me (dress shirts and djs for concerts, loads of outfits for athletics and hockey, cricket and what have you) and keeps his clothes in our bedroom. This is because if I let him have the dressing room, it would be one giant floordrobe. At least I can glare at him if he gets into bed without putting away his teetering tower-of-Pisa-like mound of clean clothes. One day though maybe I will have had enough and he will come home and find that I have swapped them all over.