A sleeveless black dress in a formal cut works for a reception when the fabric and construction are substantial enough to feel intentional. The lack of sleeves means the neckline and shoulder seaming become more important and need to be well-executed. Look for dresses with a defined waist or structured bodice rather than loose and flowing styles. The fabric should be something with presence like a blend or a heavier cotton rather than something flimsy. Sleeveless dresses work better when the hem is at least knee length or longer. These are the sleeveless formal dresses that work because every element from the neckline to the hem is considered and put together.