The tank top stretches, as it's rib knit, so the whole process is actually pretty easy! I made the skirt part about 10" bigger than my hips at the fullest part, as I like a lot of room
And, it just so happened that was the full stretch of that size tank top I used! So I lucked out. Otherwise, I probably would have had to trim off a couple inches width-wise to avoid having to gather more than I wanted or pleat or something. I'm sure if you make the skirt part a few less inches wide you'd be fine, this part is kind-of based on how much stretch you can get out of your tank top...I ended up stretching mine out TOO much when making the dress...sooo...I will need to run it through a hot wash and dryer before wearing again
Oops! LOL! Actually, for someone more of a plus size than me, it would fit perfect, to be honest.
I folded my fabric in half and sewed up the seam for the skirt. I have a serger so I serged the raw edge here. If you only have one seam (I happened to have 2 because my skirt fabric was reconned from a dress so part of the fabric was already seamed from it's former life as a dress) I would think you can either turn it to the left or right, or can center it in the back.
I 'gathered' the seam where the woven cotton meets the tank top by stretching the tank top and pinning at the middle front, middle back and each side before sewing and stretching as I sewed (much like doing smocking!). I serged the edge where the tank met the skirt after I was finished.
Hem skirt when done...mine was a dress bottom, so was already hemmed with a crochet trim.
The belt....was a bit more tricky
I took the bottom part of the tank top, decided I wanted about a 3" wide belt, so cut a piece about 6.5" long out of the remaining length of tank top. I cut open one seam so I had a long piece 6.5" wide, folded in half and sewed right sides together (like a purse strap) down the long side. Turn right-side out, center (or center as best you can) the seam on the side that will be against the dress (so it's hidden) and meet the 2 raw short ends (again right sides together) and sew to close the belt.
Shimmie the belt down over your head and arms and arrange on top of the tank/skirt top seam to hide it, or arrange on the dress at rest before putting it on. Voila!
I actually elected to tack mine down at the sides so it wouldn't move around too much as I'm not going to have interchangeable belts and so it would be always affixed to the dress. Again, because I stretched stuff out a little too much when making this, my belt ended up a bit floppy, but would work well for someone bigger than me!
Not perfect by any means, but it worked out well for how I put things together. Hope that helped!
Hmmm....unless someone else already made one, maybe I should put up a tute! Off to research and that will be a project for another day with in-progress shots