Stephenie S, I know where you're coming from. When I'm dressed I feel like me. Like the prettier, more expressive, slightly more flamboyant me that I have always wanted to be, but for so long have been unable to be.
It's not a good metaphor but drab is a bit like having to go round with one arm tied behind your back most of the time. When dressed I am free, I've got the use of extra faculties (emotional and expressive), I am whole instead of being slightly confined, bottled up.
I could go on all night... The result of course is that in general mood I feel a whole lot better en femme, but we knew that.