Quote Originally Posted by triolamj View Post
With a Utilikilt-type kilt pretty much anything goes.
That misses the point. The question isn't one of "rules," but of esthetics and fashion.

As OP's Rogue discovered, to many people's eye the proportions of the kilt wearer, and "look" of the kilt, be it modern or traditionally styled, are enhanced when the shirt is tucked in.

By the way, I got the "tucked in" advice when I bought my very first kilt, a Utilikilt, from one of their senior sales persons. Works for me, but YMMV.

Best regards,

Jake