A shirt sweater is a fake two-piece style in which the collar of the shirt is sewn into the neckline of the sweater. The advantage of this is that it can increase the sense of hierarchy and make ordinary sweaters more fashionable and individual. Wearing recommendation: There are many ways to match shirts and sweaters, and you can create different styling effects according to your different styles. Most of them will choose to match trousers or skirts, which is more casual and age-reducing. An off-white two-piece sweater is also great for fall. Bright colors brighten up your fall looks.