Everything has been very well addressed, but I would like to add bit to the issue of sitting.

widen your feet, do a sweep, sit on the front end of the chair (bench, bar stool,...) and then slide backward to complete the motion.

The sweep is the foundation element. Unless you want to leave a sweaty butt print on everything or stand up and have your kilt looking like a wad of wrinkels the sweep is required. After a few times you'll make this movement your own and it will not look feminine at all. I feel it has the same appearance as when a man pulls up his pant legs a bit before squatting to allow some slack at the hips.

The first threads I read on this subject promoted the techniques used by women. I believe all this does is make your mannerisms look like a women and this is counter-productive.

Women keep their legs together in all their movements. Sitting, squatting, bending... This is not prudent for males due to the hardware configuration on the 'M' series.

Enough of the lead in. I have found that maintaining a wide stance (about shoudler width apart) is adequate for all common movements. Just before sitting, widen your feet, do a sweep, sit on the front end of the chair (bench, bar stool,...) and then slide backward to complete the motion. all of this will be virtually undetectable to people around you once you've made it a fluid motion.

I prefer to take a wide masculine stance allowing the apron to fall between the legs. The sporran will push the apron down for you but when you are sans sporran a quick push down on the apron will maintain modesty.