My PALS wears unaltered yoga pants or jeans with an elastic waistband. We use a hygiene sling (Liko) and hoyer lift to lift out of the chair and move over to the commode. Whole backside is open in this sling so a slight tug on the back waistband and the pants move from back to front. I then lower the remainder of the way and she is sitting perfectly on the commode with no clothes to interfere. When done, I raise, clean and pull the pants back up to a normal position before moving her back to her PWC. As I mentioned in the "Gadgets" area, we absolutely LOVE this sling! You can also do a Google search for "ASL: From Both Sides" and find Diane's excellent reference where she discusses altering clothes. Hope that helps...
Jim