Roffle.
My friend bought some standard issue big white pants from Tesco a few years ago. Size 12. When she actually got them out of the packet she was so at the humungous size of 'em, she decided to donate them to her very much larger friend. Ie. me. Who had just given birth to ds.
DS is nearly 7, the Tesco undercrackers are still going strong (they are GIGANTIC tho', more like a size 18 than a 12) and I will be sad when they finally have to go to the recycling bank ...