Pressure to perform oral sex in grade school

I'm looking for help on how to deal with a 10 yr old girl who wears pants/jeans extremely tight, showing her "parts". She has been pushing back on what she's told to wear to school. I'm worried that by wanting to be accepted by her peers, she is using body image; and may be experiencing pressure from peers/boys to perform favors, (i.e. oral sex).

I understand that this is happening across the United States, and many parents are unaware or wouldn't ever consider that their precious child would ever take part or be a victim. Where can I go for advice on how to talk to her? I have to make every attempt to prevent any future sexual misconduct!

Sincerely,
1 Concerned Parent