почему-то трусы часто переводят в единственное число из множественного: knickers-->knicker, shorts-->short

http://www.ebay.co.uk/itm/SECRET-POSSESSIONS-PRETTY-SATIN-LACE-NAVY-FLOWERED-SHORT-SIZE-10-12-/391030692546?hash=item5b0b3edac2%3Ag%3Ah7wAAOSw0e9UuUfu

http://www.ebay.co.uk/itm/Panache-Sienna-French-Knicker-Size-10-Red-and-Black/232490742971?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D46150%26meid%3D83477be15b694304b9a450cfabf2a192%26pid%3D100005%26rk%3D5%26rkt%3D6%26sd%3D391030692546&_trksid=p2047675.c100005.m1851