I don't know, perhaps she should start wearing steel dresses. It may hurt though.
Yes, because every professional woman in the world who is able to do their jobs with minimal wardrobe malfunctions do so while wearing steel dresses.
Kate supporters need to be a little less ridiculous here. If she had wardrobe malfunctions less frequently it would be one thing - if once in awhile her dress blew up or it was a little too short or whatever it would be one thing, especially if she was doing a larger number of visible engagements. The occasional slip up would go rather unnoticed and be no big deal - as it is when Anne, Sophie, the Queen, or countless others have an occasional slip in wardrobe.
However, Kate consistently wears outfits that are not appropriate for her activities. She wears skirts that are too short for a professional environment, that are not made to be worn outdoors on windy days, etc. She wears heals that, while gorgeous, aren't always appropriate to what she's doing on an engagement. She fails to pull her hair back when an engagement - or a dress or the jewels she's wearing - calls for more restrained hair.
I get that you're male and don't necessarily have to think about all of this when you get dressed for work in the morning, but it's something that professional women think about frequently. It's something that bears thought when you're wearing a dress or heals or have long hair. But it's something that Kate consistently fails to consider when she gets dressed for engagements.
While Kate may be dressing spectacularly for a woman of her age when she's not working, she is consistently failing to dress for her role and position. Steel dresses aren't required, but a bit of consideration is.
And it is a big deal. If Kate was simply a professional who represented the government or a charity or another organization then she would be out of a job for failing to dress in an appropriate manner. But, even though she's fulfilled all of these roles, she gets off as she can't really be fired, no matter how inappropriately she dresses for her job.