How skinny is "skinny"? I have a set of the regular IceFalcon chausses, and they *barely* get over my legs with just a pair of pants on, with no padding. My calves are about 17", and that seems to be about the "limit" of the chausses and they're stretched almost to the limit there.
As Ian said, it's not too hard to cut out some of the excess and then lace them closed, or just rivet up the seam. I prefer bolt cutters for cutting the rings; wire cutters don't seem to do as well, but mine aren't high end wire cutters either.
For shape, chausses seem to require less tailoring than sleeves would. If your calves and thighs and similar in size, you can't tailor at the knees because it has to slide over to get to your thighs still. About the only place you can tailor is towards the ankles/feet, and since it's a relatively small area, it's probably one of the easiest/fastest places to tailor.
I can post pics of my IceFalcon chausses with measurements, if it will help you any.