“Straight size” is not a judgment, not a loaded gun or an unsheathed knife.
WTAF. It's also a nonsensical description that doesn't explain anything. What's the point of language if it's meaningless.
I don't think that I relate to people who define themselves from their body size. This intrigued me, though:
I pose a question on Twitter. I ask people who don’t wear plus sizes what words they use to describe themselves.
My answer would have been 'trim'.