From behind - you'll notice the Leib Grenadier Company has the bag of it's fur cap opver to the right, whie the others have theirs to the left. This is either a singular distinction accorded them as a mark of the status of the regiment or an error on the part of the milliner. You decide.
From the front, a further distinction of the Leib Regiment is their blue trousers. More commonly, the Alzheimer Foot has white small-clothes.