I'm hoping to make my own CW soon. I've been using this as a reference. I'm wondering if this in considered a tribute and thus would require four changes, or if it's just a reference and won't need to be shown when submitting the CW, and also doesn't require changes?

That one's just a reference :)

Ok great. ^_^ Now what about if I used say, a designer piece of clothing? Like Prada or something. Still considered a reference? I at least know I can't use designer names.

Hmm I think this is more of a gray area, I know the Lindt chocolate dress exists on site as + recolors, but there's no recolor of the original red? Other than that I can't really think of any examples, sorry D:

Ahh ok, if I do use a designer reference I guess I'll probably just try to change it up ust to be on the safe side. Thank you for the help! ^_^