Corset Pants
A simpler design than my over-bust bodysuit version (Betty & Tilly). Six panels per side low-rise bodysuit in sizes UK6-30/ US 2-26 (waist 21-45''/58-107cm). See the measurements photo for sizes.
Wear as a pair of stealthing big pants!
As with all corseted tight-fitting garments, this is not a beginners level project. There is a lot of information included about corset construction though - so if you are prepared to practise and make a few toiles, there is no reason this won't work for you.