Each person must make their own decisions.

I teach a group of preschool children every Sunday, including physical activity and various Yoga poses. I do not wish to add anatomy to the schedule. Dark coloured briefs work well for me as there is not really much chance of the pleats flying up that high.

I wear the kilt daily to my regular employment and change into a work uniform on site. Comfort wins.

When at clubs where the spirits flow, I have knit trunks in a dark colour with various sayings in a lighter colour applied. Front side "Hunk" backside "A@@". Etc.

Wear the kilt with pride. I personally recommend coverage while learning to wear the kilt. The choice is yours, and the answer is no ones (deleted) business.