Understanding the boob line

I love clothing items that define certain areas on the body like a slim waist or toned arms. They are typically incredibly flattering pieces. But, by looking at some women around me, the boob line can be difficult to understand.
The boob line, as I've defined it, is the stitch on a top separating the bust area from the mid-section. It may be accented with decorative trim or underneath a faux wrap.
It is very important that the boob line be UNDERNEATH the breasts. It can't be above the breasts or resting on them. That line MUST be UNDER the breasts. If you can't follow this rule DO NOT purchase the this style of top. Going out with oddly placed boob line makes you look like a crazy sausage stuffed into a too little shirt.