Hi Wessel. as you will have seen from the earlier posts, the clothing and equipment varied. The attached images should give you an idea, but note that the one piece flight suit, and the 'lighweight' dralon-type jacket, was also produced in an olive green fabric, and the suit also in a lighter, brown/olive colour. Some Mustang pilots, particularly those that had served with the R.A.F., preferred certain R.A.F. equipment, especially the flying boots, and often the 'Mae West' type life-jacket.
In the first plate, the pilot in the centre, with the sunglasses, is also wearing one of the very early Gerber 'G' suits, which were worked by a by-pass from the aircraft's vacuum system. The very first experimental ones were water filled!
Note also that the pilot on the left, 'Kit' Carson, is shown wearing a seat-type parachute; generally, Mustang pilots used a B4-Type, back-pack parachute, and a dinghy pack would hang where the parachute is shown, fitting into the seat pan as a cushion. I believe the illustration is incorrect.
These descriptions and illustrations are for E.T.O. pilots, there would be marked differences for M.T.O. and Pacific areas.
Hope this has helped some.
Terry.