Your mother is not going to stop. She believes she's right.

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don’t tell me to stop bringing this up when I think it’s something you two need to address.

The fact that she's going after your wife for dressing mannish should infuriate you. Because of course in order to get pregnant and be a mother your wife should be wearing heels instead of sneakers. She's not only being sexist she's being misogynistic, and all to get what she wants. Grandkids.

Your father was pulling a both sides line to keep things from escalating, but you need to have a conversation with your mom. Her digs, insults and bullying need to stop, and if she won't then you have to decide on a consequence.