To obtain a long-sleeved shirt doubling as half-sleeved shirt designed to mitigate mugginess and afford cool feeling in the case of, for example, working outdoors under the blazing sun.

This shirt is so designed that long sleeves 2 each with the upper end of netty form of high air permeability are connected, via a relevant means such as a hook-and-loop fastener, to both sleeve tips of a half-sleeved shirt, respectively.