What I've been wearing since I was injured are sweatpants made by a company called Buck & Buck
. They mostly make "nursing home clothes" for old folks, and assorted other HP gear, but these pants have zippers down each side that reach about half way to my knees. They work very nicely, though they do tend to be a bit short in the back. However the side zippers make them easier to get on, as you only have to deal with the legs and back half when sliding them on in bed or otherwise. I also do intermittent catheterisation, and the zippers let me fold the entire front of the pants down past the crotch, making it easier to access the "equipment"... (The flap also makes a somewhat usable shelf to hold the stuff in my kits if I don't have any other options)
Medical folks also seem to love them for making it easier for them to get to the relevant areas...
I also had a friend that liked to sew convert some of my old jeans to the same style, and do a semi-wheelchair conversion by adding the side zippers, removing the back pockets, rivets, etc. and adding a sort of triangular panel about 4" wide in the center back of the waist - it tapers to nothing at the side zippers. Does a reasonably decent job of making up for the "down in back" problem so that the waistline is fairly normal. I don't wear them as much though, as the stiffer denim material isn't quite as comfortable. (I've also put on a bit of a gut, so they don't fit as well now as they did at first...)
Wouldn't mind trying a few pairs of the "wheelchair jeans", but pre-injury, I seldom paid more than US $15-20 for a pair of pants, and really don't like the $50-75 they seem to want for the wheelchair jeans, even the ones without the side zippers, which I've really gotten to like...
The other thing that I wear almost always, that I really depend on is a pair of gizmos called "Cast Handles"
essentially they are a pair of velcro straps that go around your legs one just above the knee, and one just above the ankle, with a web strap connecting them. Originally intended for people with broken legs to move their casts / splints around, I find they are very useful for moving my dead legs, either for repositioning, transfers, or picking up one ankle to put it across the other knee... Much easier than trying to grab my pants, or get my hand under my leg... I got one for the splint on my broken leg while I was in rehab, liked it so much that I asked for one to use on the other leg as well... Relatively cheap as well (Note, Amazon also carries them for a bit less...)