What are some cool fashion tips for a twelve year-old that will WOW everyone she walks past but nothing overdone something she could wear on a school mufti day?

Jeans! V-neck tshirts, or polo's for a nicer event. skater or basketball type shoes for casual days depending on his style. In the summer golfer type shorts khakis, plaid, any other color shorts with...

That depends on your school and dress code . Some have several each year, others have a few weeks worth, and some have permanent mufti.

Yeah

Save white dresses with head bands and plated hair with most likely sandles.