Unfortunately I am writing while suffering from lack of sleep, one hand usable and no chance of picking up my copy of the book - are babies not wonderful (of course they are, but....)
The picture above shows the clogs recommended for when in camp. I cannot really make out the leg wear, it is either a very high gaiter (there is a change in the shading under the jacket on the right leg) or a tight fitting full length trouser, similar to that worn by grenzers.
This photo shows the alternative footwear of low shoes, as recommended for duty in the field. Again the leg wear could be either of the options given above. From behind the overall look is very much that of a Grenz from slightly later in the century (I have a drawing of one circa 1790 that this combination of shoe and trouser is shown).
Any suggestions? I can't quote from Dover at the moment but one of the earlier posts (on gaiters) does have the quote about the legwear.