Sweaters are generally well matched with clothes, and trousers are the most classic and casual wear. If you don't know what pants a gray sweater looks good with, you might as well wear a pair of black straight pants, and girls with slender legs can try tight jeans.
Most hoodies are loose. You can wear loose pants or tight pants, depending on your preference and body proportion. For fatter girls, it is recommended to wear wide-leg pants and straight pants. These two styles of trousers can well modify the leg shape and cover the flesh on the leg.
From the color point of view, gray and black are more harmonious, and gray belongs to the cold system. If you want to match more harmoniously, black is the best and white is ok, but white pants will make you fat. If the legs are not perfect, it is not recommended to wear white pants.
In addition to color matching, sweaters should also be paired with casual pants. If you wear sweaters and leather pants, it looks neither fish nor fowl.