Barely counts as a recon because its so simple, but I have turned several plus-sized women's skirts into cute skirts for my tween daughter. Explaination, then recon details follow....
Our family has a knee-length-or-lower-policy on shorts, skirts, & dresses. Some of you may be able to relate to the shopping-related problems that this can cause, if you also have similar clothing guidelines because of culture or religion. My child is 8 years old, and I when I shop for her I always see a lot of short-shorts, mini-skirts, etc., but luckily longer shorts are also popular right now, and I can easily make any jeans/pants into shorts or capri pants, so finding shorts isn't too bad...
Its more difficult to find longer skirts and dresses. Usually I buy these one or two sizes larger so that the length is good, and alter them a little bit if needed so that they fit better. I shop thrift stores a lot, so I don't mind the trouble of having to do some alterations so much, because I've saved money overall.
I recently saw some really cute skirts in the women's section of a thrift store and because I'm kind of short and stocky I don't really look good in knee-length skirts, so I was thinking to myself that it was too bad that they weren't my daughter's size because the prints were really cute. Then it occurred to me that I could probably alter even plus-size women's skirts to fit a young girl - and the price was right...$3 or $4 each!
Basically, I had her put the skirts on and marked how far in I'd have to make the new "waist". Each of these skirts had a side-zipper, so I kept that side of the skirt intact, and only "took in" the other side. I turned the skirts inside out (see 2nd photo), pinned up the sides, and marked where I would sew a straight line from top to bottom (or vice versa), making sure that the angle matched the other side (a-line or straight, or whatever). In the second photo, the right side of the photo is the side that I re-sewed, then cut off the excess fabric. I don't have a serger, so I just did a double-line of stitching. It was super-easy and now she's got 3 new skirts!
You could do this with any size skirt that is too big in the waist (doesn't have to be plus-size) as long as it is the length you want (you could always hem the length if it is too long).
First two photos show my latest creation, so you can sort of see how I did-it. That extra piece of fabric in the first photo is the part I cut off. 3rd photo is an action-shot with one of the other skirts- she doesn't have a big tummy, she just thinks its cool to stand slouchy for some reason!!!