Why the hell can you not mail Lights Out?

[Lovey]

Alright. This is probably trivial but it's finally bothered me enough to ask-- why the hell can't you mail Lights Out? It's an amazing costume that I'd love to have on my main (I rerolled) and a costume that I paid for(twice bc I got it for an alt ). It didn't bother me THAT much until I noticed that you can mail the Lights Out accessories, such as the hairstyle and the mask, but not the actual costume. 

[Draknalor]

You can't send any thing that is "sellable" after you equipt it, Same with all wings and such.