This is Kiss Me Deadly's longline (or high rise, depending on your perspective) shapewear knicker made from powernet with a stiffened central panel surrounded by lace, a full cut rear (that means there's room for your bum and it covers the whole thing!) and a vintage style V cut to the legs gives a lengthening effect.

Made in the UK, this runs towards the smaller end of the sizing - especially because it's a shapewear fabric.