Well here is the completed sleevey.
I think it would be better in a mesh or more open lace, so it would be cooler.
It needs 4 way stretch fabric to have comofrtable sleeves, but basically it works as an idea.
And if you have bought a sleeveless dress and need something like this they are easy enough to sew with overlocker and coverhem/twin needle.
If you are making a dress then you'd probably give it sleeves in the first place.