Photo: Alija/iStock

4 of 5
Know How Low You Can Go
Stick to shirts with necklines no more than four inches from our collarbones. It's easy enough to figure out; just place your pointer finger horizontally along your collarbone and put the rest of your palm on your décolletage. The bottom of your pinky will be about four inches below your collarbone; this is exactly as low as your necklines should ever hit.