While a long-sleeved shirt may not sound like a summer-ready garment, this button-up shirt is built different. For one, the sleeves can be rolled up for a casual but put-together vibe. You can wear it unbuttoned as a coverup over a sports bra, or turn it into a crop top by knotting the hem. Plus, the casual cut of many oversized options are often cooling and can feel lighter and breezier than a short-sleeve tee. Then, in the winter, you have a layering piece you can wear under sweaters.