I'm with James re Velcro. That top right buckle is under the belt anyway. Personally, I'd rather velcro the whole thing, like SWK Thrifty. Save trying to thread the left strap, fasten it, then twist the whole top so I can get to the right one, answer the phone, get the door etc. etc.; I always wear a belt, so the buckles & straps are not really instrumental in holding anything up, especially for a knockaround kilt.

I do tend to use straps & buckles etc. for more formal wear, I add a fly plaid anyway.