A skirty sort of shorts. Something that appears to be a skirt of knee-length or shorter, but which includes an integral boxer-like lining of shorts to protect the modesty of the wearer. The term can be either singular or plural when referring to a single item of this clothing. Skorts are a common feature of girls' school uniforms, for elementary and middle school children, but rare outside that setting.
Let the little girl jump on the trampoline, she's wearing skorts.
This is my school uniform, Dad: this isn't a skirt, it's a skort.