If this is what the mask looks like, I don’t think I want to see the costume.

Found the eBay listing; append the following to ebay dot com:  
/itm/VINTAGE-G1-MY-LITTLE-PONY-SKYDANCER-BEN-COOPER-COSTUME-IN-BOX-EXCELLENT-1983-/221473626349
 
(I would put the URL in the source, but eBay removes old auctions from its site after a few months, which would result in a dead link, which I gather is frowned upon here.)
 
And yes, I find it funny that they originally “asked” $100 for it, then marked it down to $80, and still didn’t sell it.

I see the one on the bottom is rolling adorably.

Someone post Michael Myers wearing this.

@Background Pony #0935  
But it is, isn’t it? :P
 
Kinda funny though one of the ponies on the box looks alot like G4 Rainbow Dash though.

@DJDerpy2013  
this isn’t official g1 merch from the 80’s.

Please tell me this isn’t official g1 merch from the 80’s.

So creepy I love it.

No “scary as sh*t” tag?