Can you give us an example, maybe with a screenshot. Poke through is a general problem with a lot of conforming clothing. Sometimes you have to make some parts of the body invisible-- the legs in particular in pants, also the feet in boots. Sometimes there's just no fix beyond postwork and the cloning brush and smudge tool. All conforming clothing needs to be with the character it was made for and all of them suffer with extreme poses--and that can include some simple sitting poses as extreme. If you show us what you're having probs with, I'm sure we can help, and I'm pretty sure it isn't your computer. Emily