Here is the school's Student Handbook, the dress code policy is on page 12:
The following standards are specific to VHS:
- Shirts & tops (male & female) must have sleeves and be properly fastened.
- All shirts & tops must be tucked in if they reach below the pockets, except
sweatshirts and sweaters; those that will not remain tucked must not be worn
- Hems of skirts, dresses, and pants must come to the student’s knees when
Note: During the cold-weather months of November-February, button down shirts
worn as jackets are permitted as long as they are worn unbuttoned so the shirt
underneath can be readily seen to be tucked in.