A black cotton half slip protects the kilt and still gives you freedom.

If you're new to wearing a kilt find a private place and walk in the wind different directions... you'll discover you're fine.

Winds that blow from your left hold the apron down.
Winds that blow from your right hold the underapron down.

Winds are stronger coming to the edge of a building, at building entrances, and near vehicles where the Venturi effect brings strong winds from under the vehicle.