Sometimes referred to as a "Column" silhouette, this style follows the line of your body, emphasising your natural shape. Unlike the A-Line and Ball Gown silhouettes, which have fuller skirts, the sheath has a straight skirt. This silhouette was first worn in the 1920s by flappers (young Western women who were flouting social norms), and, at the time, was considered "inappropriate" due to its tight-fitting nature. As a result, it did not gain popularity until the 1950s, when a more relaxed attitude to women's fashion meant that the sheath was considered an acceptable choice.
Ideal if you are slim / slender, as it will show off your toned figure. If you are a hourglass shape, and want to emphasise your curves, then this style may be for you, too. This style will look great on both tall and petite ladies.
This style should be avoided if you are pear shaped, apple shaped, or are full figured. Also, remember this style will hug your figure, so regardless of your shape or size, if you don't feel comfortable showing off your figure, or there are parts of your body you wish to hide, this is a style to avoid.