Q: What would match a gray cardigan?
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1.You can combine the cardigan with blue jeans /navy pants and a white T-shirt.

Cardigan T-shirt Pants/Jeans
2.Gray, white, and black look really good together. So, you can combine the gray cardigan with black pants / skirt and a white T-shirt/ Shirt.

Cardigan Top Pants/Skirt
3. Wear it with a black top and a pair of black pants.

Cardigan Top Pants