This in hereby is a formal request of sorts to passeth onto thee the desire to reduce the redundancy of this foolishness.
Basically I find that the vampire_costume tag in question is redundant since the tag is often used without "vampire", leading to plenty of quality vampire pics not showing under the vampire tag. This leads to reduced exposure and a general lack of proper tagging...which considering that the full "vampire" is not only broad enough to encompass costumes but also older than the costume tag, I find it strange that the costume tag was ever created.
To be blunt, the costume tag only serves to create confusion and keeps good vampire pics from being tagged as vampire.
(Full personal disclosure: I'm not sure how big of an issue this is for most people. The "vampire" tag I'd wager is seldom even searched enough to warrant any attention in the first place. But when there's a picture of a vampire doing vampire things and its only tagged as "costume" ... it boggles my mind.)
I'll check back to see how this is doing after a day or two. Got things to do. Peace.