www.poserworld.com which is a pay site has a zoot suit among other things... retro waitress. etc.

http://iso.power.ne.jp/ has some suits under "PROJECTS" that would work maybe...

Here a merchant named rwaller has a great retro hair for Vicky and a short mink coat. http://www.renderosity.com/mod/bcs/index.php?vendor=rwaller

:)