I understand completely why it felt like such a big deal.
While my first purse really didn't feel like a big thing (I threw it away some 20 years ago on one of numerous purges back then), a similar item did affect me emotionally.
I had a very similar emotional reaction to my first femal wallet, which I bought earlier this year. As I was putting all my cards in it, it occurred to me that the items that I carry on me that identify me and are uniquely mine were now in a female carrier. I remember staring at my drivers license in my new wallet and got choked up and cried a few happy tears. Just seeing it in there felt like a major stepping stone in the road to confirming who I am becoming. It was really odd...nothing else, not the dresses, skirts, shoes, lingere, makeup, jewlery, etc. ever made me feel as feminine as seeing my ID in my womans-style wallet. Funny how things happen on this journey.