Dress for Winter

If you have a molded seating system, than you want to add warmth without bulk.  Your best bet is  to invest in some fleece  and thermal shirts .  They even got thermal pants.  You can get a thick long poncho instead of a jacket.  A poncho is easier to put on than a jacket.   You can put leg warmers over your arms for warmth.  Large socks are easier to pull over the hand than gloves or mittens.