From who or where did you get your feminine clothing when you first tried cross dressing? It could be your mom, your sister, a friend, an aunt who you 'borrowed' from or they might have intentionally dressed you up. You might have also gathered the guts to buy your own from the start. So where did you buy them from?
The first femme stuff I tried were mom's. I don't remember if I tried her stuff on first or if she advised me to wear tights under my pants in winter. Either or, she gave me tights or I tried her hosiery.