Socks notwithstanding, a kilt is the most versatile garment a man can own. To wear it formally or informally simply depends on the bits and pieces that get put on with it. My question to you is... just how minimal is acceptable to you for casual attire.? ie. sporran / no sporran, belt / no belt, kilt pin / n o kilt pin, flashes, socks, ...etc. etc. or combination thereof.
What is the bottom line level of casual that is acceptable to you, under what circumstances (where) would you wear it?? What is your reasoning?? (Robbies photo gallery has a couple of great examples.) How minimalist are you??

blu

(This was not intended as another "undergarment question".)