Another vote to keep trying until you find the right one. I am not slim nor athletic build, have a generous tush and saddlebag area, and the wrong skirt (of any cut or style) can make me really self-conscoius about that area. It depends on the cut, what top I am wearing with it (suggest buying a top that will work with it when you buy the skirt to avoid having an orphaned pleated skirt - been there...).
Also, shapewear can be your best friend. Well, second-best friend to a great tailor who can potentially change a zipper waist to an elastic one or vice-versa, bring in the waist, shorten the length, etc. I keep the tags on any new skirts I am are considering and take them to my tailor for additional vetting. I have bought a secondhand pleated skirt for $8 and spent $60 on alterations, but in the end I had a piece that fit beautifully for about what I would have spent on one at retail.