This is not going to apply to many of you. Unless you are pregnant. And are tired of maternity store prices. And you have no fear of cutting into clothes.
Here is one of the two skirts I picked up thrifting last week for $1.50 each:
I pulled it on with the zipper open and eyeballed how far down I'd need to cut into it. And then I took scissors and cut straight down. Then I zipped it up and stared at the belly protruding from what used to be the waistline of this skirt.
After gathering my wits, I took an air-erasable pen and traced the bottom part of my belly out from either side of the slit. Then I took it off again and cut along those lines.
I had an old very-stretchy tank top that I cut up to use as the insert. Turned it upside-down and used the bottom of the tank as new waistband. I zig-zagged the raw edges on the inside of the skirt and reinforced the seam a couple times. (Because I do have 11 weeks to go, after all. This baby ain't done growing.)
And hey! It worked. It totally worked.
See? I totally have to go back and find some more skirts now.
(Hands-on time, about 15 minutes. The second skirt was even faster. It does help have a fairly fitted waistine, so the stretch works for you to hold the whole thing up.)