Princess Problems

We're having some princess problems over here. My daughter is OBSESSED with princesses - now I can (kind of) deal with the movies and princess toys. But she takes it to the next level...she insists on wearing a "princess dress" (which is really any dress) every.single.day.  This drives me INSANE.

skirts are ok too!

First of all, I am the furthest thing from a girly-girl ever. My idea of an outfit is jeans, t-shirt, and flip flops with my hair in a messy pony tail. I refused to wear frilly underwear as a kid and in every school picture I'm wearing sweat pants.  (When I asked my mom about this, she said I refused to wear dresses - karma's a bitch!)

 But J has taken it to another level - the biggest insult she can give another little girl is "you are NOT a princess!" And she'll tell you this if you're not wearing a dress. I don't know where she got this from...but it's too a point where she says she's not a princess if she's not wearing a dress. At school, she had a full on meltdown when they had to change her clothes and all they had were pants. 
 This kind of breaks my heart. I want her to feel like a 'princess' no matter what she's wearing.  And we try to enforce this when she's playing soccer (and can't wear a dress) by saying how she's still a princess even in her soccer jersey. And when she has swim - obviously, she's a swimming princess.
Are we doing major psychological self-esteem damage here? Is this just a princess phase? Will she ever wear pants again? Are there any princesses that wear pants?
My husband makes fun of me, he thinks this is "my" issue - not hers. My response to him?
"You are NOT a prince!"