A repro. Civil War haversack would look simple and masculine, too. Lots of companies do those - e.g., here in plain canvas or tarred:
The rabbit cloak sounds like it'd be fun to reverse engineer and make. As to the pants, are you talking something similar to the fisherman's pants, but crotchless with a long strip of fabric sewn in the back to act as a breechclout? Or something that opened is essentially some fabric twine and 3 separate sheets of fabric and when folded leaves the inner leg open, but protects everything else?
I'm playing around with a design I've had in my head for a while: a deconstructable coat. The outer layer would be leather. Under that would be a zip- out lighter jacket (I'm thinking denim or something to that effect.) The jacket would have a zip out flannel liner and detachable sleeves. It would have snaps at the ends of the sleeves to snap into gloves, zip shut with a flap over the zipper, and be as unbulky as I could get it. I'm trying to figure out how to make it fully adjustable: wear it with the jacket, but not the liner; with the liner but not the jacket, with "growth pleats" to be able to wear heavy sweaters under it without it being overly bulky when not wearing sweater. Plenty of interior/ exterior pockets for storage, including a couple special pockets I'm toying with: A pocket under the neck for something similar to a caamlbak pouch, a few small thin pockets for putting self heating pads in, and a pocket on the outside large enough for a decent size hardback book (expandable, of course.)
"No fate but what we make"- Sarah Connor, Terminator 2
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, steak in one hand, chocolate in the other, yelling "Holy F***, What a Ride!"
My Primal Battle Tome