I don't pay much attention to low-necked clothes. You can wear your own style as long as you choose clothes that fit you. However, it's best to wear a scarf during the festival in deep winter. A suitable scarf can not only keep warm, but also set a good example, which is essential for urban men. If you really don't know how to match, you can refer to the "wild color" mentioned above. Black and white can be said to be "never wrong", and black is more visual.
Finally, cardigan sweaters are generally suitable for home clothes or leisure collocation, and are suitable for leisure friends in work or life. Generally, you can wear it casually, with a plaid shirt and slacks inside, which is not too formal.
Because cardigan sweater itself is a manifestation of leisure, mainly focusing on comfort, not collocation. Of course, it is best not to imitate others when wearing a match. It is best to wear your own style, regardless of the price of clothes, but you must pay attention to it. This is the first prerequisite for wearing your own style.