I am trying to find a site that explains how to do relatively simple to advanced alterations on RTW garments, mostly jackets. For some reason this is proving the most difficult search I've ever done, and I'd conservatively estimate I've done about one trillion searches on the net by this point. There is endless information about pattern alterations (for "new construction"), but I want to fix some OTR stuff I haven't worn because it doesn't fit just how I want it to. In particular, right now, I would like to know how to go about taking in a back seam and the side seams on a jacket, all the way from step one, "cut open the lining specifically HERE" to step whatever, "sew the lining back together in this manner, press here, etc." The immediate problem I'm having is that the back seam of the lining is machine sewn, and if I cut it open there will be no way to put it back like it was. I'm thinking I am supposed to rip the bottom seam and turn the whole thing inside out, but I don't want to mess it up, even though this jacket is just a project at this point. Help. Thanks. J.