My mum in law has a completely different choice in clothes from me. I went through a similar situation, but one day we had gone shopping together and she realized I pick completely different colors/styles than what she would have picked for me. From that day whenever she needs to buy something for me she either takes me along or just gifts me cash instead so i can buy what i like. You can try going shopping with her - maybe she just doesn’t realize that styles have changed. Especially true if she doesn’t have a daughter. (My mum in law has 2 sons so she herself tells me she doesn’t know much about what young women like to wear)