First of all welcome to the neighborhood from just up I-85 a bit.

Tall guys actually look really sharp in a kilt. As a 5'10" dude I have to balance things more carefully to not appear too squatty

To be brief, A stillwater has a 24" length which would be better than the 22" standard sportkilt length for your height. But at 6'9" even 24" might be a little short for you but fear not, stillwater and sportkilt can do custom lengths for an additional fee and lead time.

Welcome again.