Comfort and health were my first and main reasons. Style has been a side-benefit.

Comfort has been addressed plenty, health not so much. Basically, I would from time to time get some aching and also quite acute pain on contact, not pleasant. I read once that there might be link between that and wearing tight underwear, or clothing that could at times be constrictive or pinching. Well all I know is, since I've started wearing kilts regularly, I've not suffered from it anymore. I'll let you know if I do!