I wouldn't worry about it. Especially when you're younger and don't know what's going on, it's not like you really had too much control over your body! It was probably the way the clothing felt - women's clothing would feel different against your body than men's clothing as the cuts would be different. You said the clothing was too small - it was most likely just some stimulation from the clothing rubbing against you!

Also - I think a lot of boys end up being dressed in girl's clothes at some point or another. My dad was dressed up by his sisters.. there's photographic evidence of my younger brother wearing my nightgown, and my nephew has been dressed up by his sisters a few times. It's quite normal and nothing to worry about!