J.W.
If you're not ready to potty train, put her diaper on backwards and put a snapped onesie on and then jeans. Hopefully by the time she can get out of all the clothes, you can catch her and stop her!
Almost sounds like she's ready for the potty, though...Try some potty training books with her and see if she's interested. My dd potty trained in about a week at 2 years 3 months.
good luck - poop on the floor is a pain!