A tank dress it is.
McCall's 6559 maxi tank dress and decided a size 12 would probably be fine. It's a knit dress...fitting is not that big a deal.
But I *assumed* the armhole/neckline bands were drafted correctly. I think I'm going to take them off, shorten them a bit, and put them back on. They're a little gappy. Not bad...I could wear it as it is...but it could be better with a half hour's work.
Other than that, no real complaints. It's just a long tank top, after all. The construction order in the instructions is a little different than what I typically do...the neckband is inserted in the round, but the armhole bands are applied flat, before the side seams are sewn. That's pretty much a matter of preference, but I think the end product looks nicer if they're inserted after the side seam...no awkward seams to deal with.
In a less stretchy knit I'd definitely want to size up everywhere but the shoulders. By itself, it's not terribly flattering...but that's not the fault of the dress. Under a topper, though, with the close fit somewhat camouflaged, it looks happy and cheerful.
I think once I tweak the binding bands, it'll do.
And I have nearly 1/2 a yard left for accents on some pieced Tilton top...lol...