I have just bought a whole bunch of these at a bargain prize, and thank goodness for that because they are unbelievably uncomfortable. The lace at the back behaves like a thong, except it is not just a thin strip of fabric, it's a sizeable piece of lace wedged all the way in, and then the top back of the knickers ride all the way up my waist. How exactly are they supposed to fit? www.marksandspencer.com/2-pack-light-tummy-control-assorted-brazilian-knickers/p/p22334548