Long sleeved thermal vests

Joseanne they are on the slinky side - your clothes sit smoothly over them and they are not sweaty. I think they are great.

Re the poppers, Welbeck there are some very upmarket ones made for professional-type women to keep their shirts extremely tidy with a tucked-in but no creases look.
One of my adult daughters has one. It looks like a turtleneck.
Hers was made by Wolford I think.
I read somewhere that the Princess of Wales wears them

www.wolfordshop.co.uk/clothing-and-bodywear/bodysuits

For you Welbeck!

And here's an article about the bodysuits - it's from America I think but you will get the idea.

corporette.com/best-bodysuits-for-work-outfits/