Oh this is one I can answer!
Secrets in Lace carries bullet bras and other mid century lingerie styles: https://www.secretsinlace.com/
They have some clothing options, I've never tried those or the bullet bras but have had good experience with other undergarments.
Unique Vintage also carries repro lingerie as well as clothing, they carry their own line as well as other brands:
https://www.unique-vintage.com.....s/lingerie
I bought my first petticoat from them this year for a 50's style dress I had, it was super fun to wear.
I'm not sure on the quality of everything at UV, price points are low for a reason. But they have a good return policy.
https://pinupgirlclothing.com/ is another one to try, they also carry lingerie, not sure if it's different or similar brands to what uv stocks. I've window shopped but haven't purchased from them.