Wardrobe support appears to be out of date, at least with the current version on Classic servers. The Wardrobe object is now a local variable in the file and I'm not sure if it's exposed anywhere.

Where is the official classic build hosted btw?

If, like you say, it's not available anywhere on the global namespace, then there's actually nothing I can do to fix it either...

I've been using this one.

However, having done some actual digging around I'm pretty sure it's not an official release; more like someone using the same name as Wardrobe-AL.

I think it's a fan update. There is no official Wardrobe for wow classic as far as I klnow