Well I know I always do...but I guess maybe some don't...
Wear pants over top of the underwear.
yes
Some teenage girls choose to wear thongs as underwear for comfort or to avoid visible panty lines. However, preferences for underwear styles vary among individuals, and not all teenage girls wear thongs.
Some people are more comfortable not wearing underwear.
2%
Some but it is unusual
underwear and a gumshield.
Some girls like to wear no bra and underwear because they like the freedom of not feeling restricted in tight fitting undergarments.
A boy does not need to wear a girl's underwear if his crouch is getting big because the underwear is not designed for them.
Generally any color.
some girls do, some don't. it really depends on her
You should make a list of the pros and cons, plus why you want to wear girls underwear. As a 12 year old boy, you will need to make your mom understand why you do not want to wear boys underwear.