Hit the outlets in Leesburg. Nike, Adidas, Under Armour, etc are all up there. I buy a lot of my kids stuff from the Nike store.

If you live in driving distance of an outlet mall you can visit a Nike and/or Puma outlet. Should have a decent selection though they may not have the latest releases.

We buy a ton to try on from nike online, the return all the ones that dont fit to the Nike store in Fair Lakes

Foot locker or Champs in malls.
But most stores don’t carry a good selection of basketball sneakers. My son researches them online (YouTube reviews) and we buy them on Nike or Dicks sites. We’ve also purchased Kobe sneakers on GOAT.

Other than Dicks sporting goods, what physical stores in fairfax/loudoun county can a high schooler visit to try on basketball shoes?