A lovely and exquisite option for formal events, such a black-tie affair or a wedding, is a strapless long A-line gown with a side high slit. Since it cinches at the waist and flares out into a full skirt, the A-line silhouette is universally attractive. The high slit makes it easy to move around and gives the outfit a hint of seduction, while the strapless neckline adds a touch of glamour. Keep the attention on the dress itself when accessorizing this kind of garment.