The Buckskin leggings.

Sweats are great for comfort and mobility, but they wont last two feet in brush. Jeans have no mobility and arent much more durable. I used under pant pants that were nice as they hug the legs and were shockingly durable but they are made of plastic which will pollute the environment. The thorns and bramble penetrated and snagged, and like most woven material, they cant prevent mosquito bites.

 In winter I have used military issue, nylon, heavy weave, pants. These are surprisingly durable in snagging bramble when it comes to an outer shell for more delicate inner layers; but these are plastic and they make all sorts of noise from scrunching to whacks from the trees and they WILL frey and tear eventually. The groin can also be a pain.

When in the dense bush, the buckskin leg covering is the best material to cover to your legs. Until the deer hide buckskin became a scarce or pricey commodity, they were the only material that could stand up to the bramble, keep the legs warm, kneel on the floor, break kindle, dry relatively quick (think swimmers shammy), and protect the body from all  biting bugs.

Leggings will also free up the groin for crouching, climbing, and log crawling. There is no crotch to inhibit thigh and joint mobility. 

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Wear a generous loin, particularly for your rump - do not cheap out when devoting material for this. The rump flap will cover your butt when sitting down on bramble. Alternatively, you can wear a long shirt or buckskin top that reaches your lower thighs.

When the mornings are cold, an extra breezy loin can be an uncomfortable caloric drain on you. You can use a wool - as in a reused, shrunk sweater cut up - or pelt skirt  as a privates cover with a tie cord to close the gap between the legs - think bad-ass diaper.

To this day no cotton weave or common polyester fiber bought at a hunting shop will compare to the non polluting quality, toughness, expediency of pooping or durability.

Your pair can be the last leg covering you will need to buy. All outdoorsmen and women, like nature photographers, hunters, foresters, law enforcement and trappers can benefit too from this technology.

The only way to ruin them is rot them. Rain is fine and experience has shown that leggings hold up to water quite well. 

The leggings look better with time and wear and don’t need to be washed. 

When making the hides to use for the leggings, make them as soft and plush as the base dunk solution can offer. Also, design them tight and flush with the contours of your legs. Have the lower part of the leg made such that you can just comfortably fit your foot through when putting them on. As you move up the leg determining the size of material, crouch and make sure you can bend your knee. They may be painful to wear on the first two days, but they will quickly stretch and adapt perfectly to the bend of your leg.

Dirt increase the camouflage qualities but a spot clean may be appropriate at times.

What you need are two bucked hides and a means of keeping them up. You can buy finished skins from artisans who would appreciate the business or just get some raw skins yourself or from hunters and make a pair.

I don't like tight things around my waiste, so the belt attachment design was out. As my first attempt, I used some old coveralls (legs torn off - like, hip-torso-alls') and attached the top of the legging to the bottom of the pocket section on the outside of my legs - did not work; when I needed to lift my arms (say for bow hunting) the leather would catch my inner thigh.

Suspenders, were my second approach. One attachement at the front of the leg, the other to the side of the butt - not over. I could see that this would soon wear out and destroy the suspenders. I also determined that the metal clips were out of place in the bush and irritating on my skin.

My third attempt left me using thick moose hide smoked thong/suspenders. Where the suspenders cross over the shoulders I widened the strap. The thong would attach to both the front and rear/side of the legging so that the strap did not cross over my butt. At the high chest and high back, the straps were tied and secured to each other by a separate thong; this was done to prevent the suspenders from sliding off the shoulders during use. The hide is rough on the skin and I find that normal body movement such as crouching, standing from a sitting, bending down, all caused much, unavoidable movement of the leather that crosses over the shoulders. The abrasions will require getting used to.

Blood may be abraded with a stone to clean buckskin.

Have an awl as it is the only required tool to make modifications and repairs to buckskin clothing

As always, watch for and respect the life, big and small, that will be around you while these are in use. The temptation will be to smash your way through everything and you must refrain from neglecting the life trying to cary on around you.

Also read this.