LOL, Melissa! Your calendar share really takes me back to my childhood. Both my sisters had 'Barbies' as pre-teens & I designed & made a few outfits for them using bits of this & that.
At one time I dreamed of being a fashion designer (Mr. Dan @ Sacks of the Bowery) & designed lots of costumes/fashions during my college years.
Far as seeking 'fashion' stamps? I haven't. But... Several years ago on Club Posh, I offered a challenge to fellow members to create fashions from their stamps. Dee (Grunig) provided some pics we could use as paper dolls & we stamped her a wardrobe full. Rather than using an 'outfit' stamp, we used parts of many stamps (not just Posh ones) & built out designs--casual > red carpet creations. Alas. I think I deleted all my entries from my files.