Cookie in a bathing suit with that kind of sartorial competition would have been perhaps more ludicrous! Let's face it, she was not blessed with height so that the minute that she started to spread, the effects were more visible than perhaps they might have been on a taller woman.
The 20's and 30's were eras in which the woman with curves was perhaps at a disadvantage; this was definitely the case for the QM. Leuchtenberg, that's a good point about her loathing of those three stylish women; it is quite possible that all of these women made her inadequate for differing reasons. We know that Wallis never missed a trick in mocking Cookie for her lack of sartorial elegance and found her dull in the extreme; Marina came at it from a different angle, considering that Elizabeth and Alice Gloucester were inferior to her in terms of pedigree. As for Edwina, she was of course sufficiently wealthy, beautiful and soignee not to give a stuff about what some short fat bourgeoise thought about her, and made up her own rules for life as she thought appropriate. Small wonder that Cookie felt intimidated and diminished by these three exceptional women.
When she married the Duke of York, there was little notion that one day the couple would be called to perform duties for which neither were born, so her status was perhaps less of an issue. After the war of course, the royal marriage market had collapsed and thus the choices of matrimonial partners for the children of George V was much more proscribed than it had been for him and his father's generation. Elizabeth Bowes-Lyon and Alice Montagu-Douglas- Scott were perhaps not such bad choices as brides for the Windsors; both did their jobs well and became very popular, as well as introducing some fresh blood to a clan that probably needed it.
Perhaps Cookie had the last laugh anyway. She lived longer than all of these women whom she despised, was revered by many (in spite of those teeth!) and lived off the fat of the land, every inch a queen long, long after they had shuffled off this mortal coil..........