You should wear a shirt that depends on the weather and the same with pants. Always sneakers though and if you plan to go swimming a bathing suit under your clothing.
yes she should wear a bra
You should wear your best outfit you have and get answer.
Briefs
Clothes
Should a 10 year old wear panty liners
she should wear clothez
Wear pajamas to sleep. Most people do.
I don't think a nine year old should wear one at all. There is no reason why they should wear one. They are to young and they need to let their body develop somewhat.
they should as long as they want to
Be a guy.
NONE
Oh god, no.