When it barely covers your crotch, it’s Not a Dress.
When you couldn’t lean forward even slightly in it without showing the world your underwear, it’s Not a Dress.
When it closely resembles a tank top, in length as well as in appearance, it’s Not a Dress.
When it has a weird, sheer half-sleeve (but only one of ’em, mind) which appears to be attached only with a cheap looking zip?
Well, OK, we guess it COULD still be a dress with one of those, but let’s just say it’s not a dress we’d be interested in buying. Especially not for £225.