I wear tank tops under my shirts but I have a few sweaters that are a little itchy and the knit is thicker which means it's not tightly woven so I have to wear a jacket over it when I go outside. Do they make long sleeved cami's that are really thin and would fit comfortably under a thick sweater? If so who makes these?

Liam is 5!

Re: Do they make long sleeve camisoles?
Walmart has a brand called Metro7 - they have a very thin longsleeved t-shirts that might do the trick. Similar to a tissue tee.