They are excellent for providing a nice smooth line around the waist and accentuating the torso. For the past few years we seem not to have been tucking things in but just letting tops kind of fall around that area (or shudder, creating a muffin top). Even if you are layering cardis or jackets on top to me it makes sense to have some neater proportion underneath. I always thought they looked particularly nice worn with a printed a-line skirt.
I first saw these on sale at my local Sainsbury's of all places. They had quite a few colours plus a leopard-print and a striped version all for £8-£10 including their plus sized True range. A net search located a few more sellers including Henry Holland for Debenhams and Oasis but not yet any of the high street sellers with extended size ranges. They will follow suit soon; just look at the current tragic situation with jeggings.
I think this time I'll be buying mine at American Apparel. Apologies for the cheesy photo but this is from their website
This version comes in four colours and has a high spandex content that will provide a nice bit of support and shaping. It goes up to size XL which should be OK for me as UK size 20. These things stretch trust me. I was also pleasantly surprised to find on the AA website that there are a fair number of styles in 2x and 3xl (not alas bodysuits as yet)
I cannot leave the subject without touching on the oft-commented on problems encountered in the ladies room whilst wearing these items. Again I take you back to the late 80's/early 90's which for me were my serious drinking days. Even through that haze I think I managed to avoid serious accidents and it was simply a matter of practice. Dungarees in my expeirence are far, far tricker to manage.