question:  Why do the webfoots only wear skirts?
context: A gray, funnel-shaped cloud of dust stood off to his left. Weather control made cyclones and other climatic phenomena on earth practically non-existent. He was here and Earth was somewhere up there. The sun burned fiercely, although he would have said it was about four o'clock in the afternoon, if this had been Earth. But then, how could a group of loosely spaced grains of sand possibly have a nervous system? When it changed to a cube he drew a square, a circle for a sphere, and so on. He became so absorbed in doing this that he failed to notice how the wind devil drew closer and closer, but when he inhaled the first grains of sand, the realization of what was happening dawned with a flash of fear. These creatures were not only humanoid, but definitely human, although more slight of build than earth people. All were dressed from the waist down only, in a shimmering skirt that sparkled as they moved. The men were dark-skinned, the women somewhat lighter, with long flowing hair, wide lips and a beauty that was utterly sensual. They had exhibited human emotions of anger, fear and, that most human of all characteristics, curiosity. But up to now the tube and the chain was the only evidence of an advanced technology, unless the ancient inscriptions in the stone wall of the pool, and the statues lining the wall were evidences. An object like a pallet was brought, carried by four of the women. There, at the cavern entrance, the wind devil writhed and undulated in a brilliant harmony of colors. One of the women came toward him, long golden hair flowing, firm breasts dipping slightly at each step. It is impossible to move a physical body from one place to another by a mere thought and a tiny instrument, yet you have done so. These are the undesirables, the incorrigibles, the nonconformists from the sixth planet.
output:  The Sand God burned everything, except for the skirts.
options:  Skirts are traditionally worn by prisoners. The webfoots on this planet are all criminals or descendants of criminals.  The people from the sixth planet only sent skirts, when it was communicated that the Sand God had burned everything else.  The Sand God burned everything, except for the skirts.  Skirts are the traditional dress for the webfoots culture.