These days, men are also insecure of being too thin these days. They always crave for a good build. Thin men should always dress according to their body type. You need to choose those type of fabrics which make them look with a little more added weight. The type of cloth and the fabric you choose helps in building up your look.
Always go for shirts or t-shirts with horizontal lines and choose tweeds and glen check fabrics it helps in adding some substance to your structure. Remember, too slim cut will bring out your narrow frame and too loose will make you look stouter, therefore it is necessary to wear clothes which fit you right. Try to hide your flaws and flaunt your merits. After all, your goal is to add some depth to your frame.