How do you change your avatar's hair color? Every time I try, it doesn't want to.

go to the hair you want, click on the color you want, then click add to avatar THEN click save avatar. Acutally, anytime it looks like your doing something in Wardrobe, but it isn't it's because one or more Save buttons ahve recieved insufficient amount of clickage. Click Save Avatar a lot.

Or, you've got some add-ons that make the Wardrobe go wonky and it won't matter what you do until you disable them.

Or, you need to clear your cache and cookies.