Agree with what was said here , your crossbelt must never droop or be loose fitting I see many pipers wear their crossbelt over the plaid , I prefer to wear mine over my cross belt and the plaid hooked under the buckle and everything worn tight against the body so nothing moves and the waist belt over the cross belt to keep it pulled down and tight the v of the cross belt sits on my hip sort of level with the inverness flaps , there is no exact measurement. More play around and see what works and adjust as needed BEFORE I must play , usually the day before I run through everything and put the lot on and adjust and check then its normally ready to go the next day . Cheers !