Three quarter sleeves work for everyone whether they are on a shirt or a dress. They are cooler than full-length sleeves making them just right for the heat of summer and they can be worn casually or formally. They also flatter full arms which would be more pronounced in long sleeves. For a cool hippie look, wear pretty cropped, embroidered, three quarter sleeves tops with a pair of jeans or hipster pants. For work, wear well fitting ones with your work pants or skirt. Shirt dresses with these kind of sleeves are also cute and can be dressed down for lounging or dressed up for working.