So I noticed that some of my knickers from M&S have a rather strange gusset feature, in that it is not sewn in around all four edges leaving a rather odd pocket at the front. This troubled me greatly as my life is fairly dull and empty, so I decided to have a knicker gusset comparison study with my other underwear purchased from other companies. Most of the other pantage from other vendors had the gusset sewn in properly. What is the mystery pocket that M&S has kindly added actually for? AIBU for wanting to know the purpose of this odd little flap (pun intended)?