I think this is normal behaviour - good isn't it? Poser should calculate the collisions to avoid poke-through on dynamic clothing. Sometimes it fails, and sometimes the intermediate steps look a bit scary; but it usually succeeds in the end. Situations where it might not are where the clothing is "pinched" between body parts, so that there's nowhere for it to go; and some clothing just doesn't seem to work in the cloth room, due I think to the way it's made. Looks as if his pants could do with the dynamic treatment too. :)