homecoming dress stores

So my Queen needs a suit or something nice to wear for her ride... I was thinking about a suit like the girls wear for homecoming court... where would I find something like that? The formal dresses in stores today are not appropriate (or comfortable) for Allison. I’m not sure her size maybe a 7 or 8... I’m willing to even borrow or rent one if I have to. Just want my girl to look beautiful. homecoming dress stores