You can't put Resshi Attire in the Armoire.

[wereotter]

Over half of my Glamour Dresser is Mogstation items I believe. And I really wish this needn't be the case.

.... you have over 200 Mogstation items? The dresser can hold 400 items....

LOTS of mogstation items go in the armoire, nowhere near none. I could buy that bunny costume, and it'll go right in.

What you're referring to is an old event item that was placed in the mogstation a year after the event occurred. What the commenter you're quoting is referring to are outfits made specifically for and released directly to the mogstation.