Hi - I was wondering if it is possible to extend the length of a black skirt (in profile - basically would need to add a triangle sized piece of cloth to make the skirt look longer). The person isn't moving, so the graphic could almost be stationary. Any tips/advice/tutorial videos that you can refer me to would be great. The video was shot in HD 720p, and the skirt is very slightly different shades of black/gray. Any help would be appreciated. Thanks!