I dont know why but I was the same when I bought my first purse. Having bought bras, panties, shapewear, dresses, make up--all sort of things that would mark me as a crossdresser, but it was the purse that I had doubts about. But like others have said, practicality took over when I started going out and realized I didn't have a place to carry my things. I love how feminine I feel with a bag hanging off my forearm or when I'm holding a clutch; it really helps me (oddly) with femme postures and mannerisms!