I'd say I probably wouldnt ride in a kilt either.

That said I have and still do ride in shorts/t-shirt at times, it's my choice and I set my own standards. Anyone that judges me and tries to tell me I should wear this or that is told where to go fairly promptly. Had too many people preaching ATTGATT to me already. Simply advice not asked for. If they enjoy their kilt ride (by the kilts lifted photo it looks like they do) good on them I say.

Al