Why don't my booster costumes show up on all characters?
What you're describing is not how it's supposed to work. Double-check that you're looking in the right menus and then get on the horn to customer support.
Unless you have three different accounts, all the purchased costumes should be available for all characters. However, a few of the costumes are limited to specific body types - mostly from the Magic set, where the Bolero jacket and Witch outfit are Female only, while the Baron outfit is only for Male and Huge. Other than that, it should definitely appear in the appropriate categories for all of your characters.
Also, some costume articles are restricted by others (eg: back options conflict with trenchcoats .. )
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"Chew Electric Death, Snarling Cur!"

I was under the impression that all my toons should have access to booster costumes, but it doesn't seem that way.
Only 1 has access to the Valkyrie costumes, only 1 has access to the Scientist garb, only 1 with access to the wedding tuxedos.
Thanks for reading this.