On a movie discussion board we once looked into the use of body armor by the comic book Batman.
I found one instance early in his carreer where he'd worn soft body armor under his costume during a battle on an airship. Soft concealable armor in those days was made from tight woven layered silk, suprisingly effective when projectiles were of small caliber and low velocity, such as the .32 pistol, not much good against higher velocity rounds like the 9mm except at a good distance wher velocity dropped.
Effective manganese steel armored vests were available since WW1 but were heavy and not easy to conceal.
I also remember several 60's era comics in which the Batman had a number of specialized costumes, underwater diving etc. Albert once filled in for Bruce Wayne by wearing a Batsuit, with fake muscles of course,and with built in aids, such as a device in the boots that let him seem to leap great distances, not sure but it may have also been armored.
I'm not sure but Bruce Wayne may have once impersonated Superman by wearing a similar outfit with built in flying aids and bulletproofed.
Been going on fifty years now so I'm not sure of any details.
If anyone remembers these stories let me know.
Heres a site with a free PDF download of "Helmets and Body Armor in Modern Warfare"
It will give a good idea of what sort of armor an old time crime fighter might wear.
Ironman is all about armor, and an old favorite "the Atomic Knights" used armor salvaged from a museum to fight evil in a post apocalyptic world.
Any others you can think of?
http://www.archive.org/details/helmetsbodyarmor00deanuoft