I am about the same size as you, I am 5’7’’ and weight 155-160lbs and have about a 33’’ waist and the M drysuit fits me really well. I usually wear fleece underwater and a fleece jacket underneath the drysuit when its cold and the drysuit still fits comfortably.
I think you have to buy the suspenders separately…but I don’t see them for sale on the website. I got my drysuit used so I already had the suspenders in them.
I have short legs as well, I just roll up the outer portion of the drysuit legs while I am on land and when I am about to get into the water make sure the outer portion is rolled back down. I find the legs don’t drag on land as much if I do it this way.