Butterfly sleeve is a beautiful sleeve with a puff on top and slightly loose at the hem. It is basically a puffed sleeve but one that doesn’t taper off like the normal puffed sleeve, nor ends in a cuff. It has a very elegant look and is usually paired with low cut gowns.
A cap sleeve is a specific sleeve style found on short sleeve shirts, dresses, and other garments. In fashion, this term is generally a descriptor reserved for women’s blouses and T-shirts, though it refers more to the specific cut or style of garment, indicating that the sleeve is cut and seamed to fit the shoulders correctly.
The puffed sleeves ( Puffy leeves, puff sleeves all one and the same) have an old world charm ( a Victorian era reminder?) which is great, but only if you have the body for it .If you have a narrow top body ( a pear body shape) or a slim figure go for the charming puffed sleeves. This sleeve will bring a balance to a body shape with broad hips.