The square neckline gets its name from the shape that is formed with the shoulder straps and the upper half of the top/bodice.
The cut of the fabric has a very crisp look to it, and 90 degree angles are formed where the straps join the bodice. The part of the top/bodice which lies between the straps is very straight, adding to the square appearance of the neckline.
Sweetheart
Imagine drawing a heart across your chest. Start under your left arm, and visualise a semi-circle that goes above your left breast, down into the centre of the cleavage, and then repeats itself for the right half of your body. That, my friends, is the sweetheart neckline.
This is yet another neckline to which sleeves or straps can easily be added to create the perfect outift. Check out the Straps & Sleeves article to see the full range of options.
T-Shirt
An easy one.
This neckline follows the same line as a standard crew (round neck) t-shirt. The T-Shirt neckline is also referred to as a jewel neckline (for obvious necklace-related reasons!).
V-Neck
Typically combined with straps of at least 1 inch wide, this neckline falls from the straps into a point in the cleavage.
How high or low the neckline falls to is a matter of personal choice. Typically, for Brides with very large or very small breasts, the point is quite high (just below the top of of the breasts). For everyone in-between, something a bit lower is usually the order of the day, often accompanied with a healthy dose of lingerie tape!