1, Shirt: Men and women, low-necked sweaters can choose a shirt as an interior. Exposing the collar can increase the layering and look better.
2. Thin T-shirt: For those who are used to casual style, you can choose to put a thin T-shirt inside. The pattern should not be too complicated. Solid colors or stripes are more suitable. It doesn't matter if the neckline is higher than the sweater.
3. Shirt: If the sweater is turtleneck, you can choose to wear a shirt instead of an undershirt. If it is a round neck, you can choose to put a shirt inside and turn the collar out.