Labelling them 1 to 6 from left to right, put them in order of their weight from lightest to heaviest.
Ok, ok, you're smart and you smell a trap, the sort that QI indulges in. And you are right: these splendid ladies, despite appearances, are all the same weight, 154 pounds imperial.
Does that amazing revelation not give you a profound sense of something or other? In my case, it's the other.