Ambiguous

My dress is either black or brown; I really am not sure. It’s covered, too, in polka dots, A part of its allure. When choosing shoes and jewelry To match, I go with brown, A choice I reaffirm in mirrors Or when looking down. Yet once I noticed someone else Who wore the dress as well. Her shoes were black and yes, it matched, As far as I could tell. I’ve had this problem just this once But what it’s clarified Is next time I won’t buy a dress Ambiguously dyed.