Small Formal Dress (once a bridesmaid dress in Hattiesburg, MS

I'm not sure how to describe the color other than light lavender-ish blue with nice embroidery and beading near the neck. 2 pieces, skirt goes to small of waist (near bellybutton) and top sits over it. It's cozy enough to dance in and nice enough to look distinguished. Elegant and modest. Just a smidgeon big for me. Sizewise I'd say it's around a 2 or 4. I have to wear a 0 or a 2 I think. I'm 5'3"ish and 110 lbs so I guess if you're close to that it should fit. I'm not sure what to price it really. I don't want to go yard sale low because it's a really nice piece and in good-as-new condition, but I don't want to be ridiculous and price it store-high either. We can figure it out though. $40 was as close a guess as I could think of.