Floral Print Denim Minidress

The material is very pretty and unique. It is a medium-weight denim. I ordered this in Size Large, according to the sizing chart. For reference, I'm 5'2.5" tall, 36C, 30" waist, 123 lb. It falls to about 2" above my knees. It fits, but I'm still deciding whether or not to keep it. First the armholes are somewhat big, making it impractical to wear without a shirt underneath in order to cover my bra or what is under it. Additionally, there isn't extra room in the chest area, so I wish I didn't have to wear a top under it, but I do. The hip area is a bit wide for me, as I'm pretty much hourglass with hips about the same as above my waist. That might be ok, as it isn't a huge difference, just a little bit. Surprisingly, the top 3 buttons are different than those below. The top 2 are same style as each other but different colors and round. The third button is unlike the rest and square. The remaining ones below are all round and match each other and are darker than the ones above. Curious why the buttons aren't all the same. It is cotton spandex, and if I decide to keep it, I hope washing in cold water and hanging to dry doesn't cause shrinkage, as I probably won't be able to wear it.