Does anyone know where to find thin (long or 3/4 sleeved) teeshirts to wear under sleeveless summer dresses?

I'd try the Talbot's clearance rack, as well as the Target and Old Navy clearance racks. Good luck!

Thank you, janika. It's a problem.

There is an online site called Halftee. I've never tried them but after looking at their site I think I'd like to try a couple.

Thank you both for your answers. There was a company which made something to wear under dresses but it was expensive and I think is not in business now. I saw a suggesion of adapting a pair of opaque tights/ pantyhose to wear as as sleeves under sleeveless dresses, but I haven't dared do that yet...

I wouldn't spend too much for a speciality item for layering. I have seen many short T's, aka cropped tees in the junior department. Try Boscovs, Macys, Walmart. They can be purchased on line. Probably even Amazon. Google cropped Tee's.

Thank you. I'm wondering whether ordinary teeshirt material would be too hot. Anyway the weather seems to be gradually cooling here, so may not need to solve the problem until next year. :)