Basic rules for wearing a shirtdress
There are a few things that women of all shapes should watch for. First and foremost, your shirtdress should not gap in the front, nor should it show your bra when you move around. If it does, it's either the wrong size or a bad cut for you. Some styles will let you get away with a cami underneath for modesty, but ideally, you want one that fits your chest. Additionally, make sure the sleeves fit your arms properly (not too tight) and that the skirt flows out around your hips. If anything is tight, jump up a size.