You can wear a long-sleeved top outside the thermal underwear, and try to adjust the color to a soft light color, such as beige.
You'd better wear pants in your lower body. If it's not too cold, wearing a pair is enough. You can choose dark pants, jeans and so on.
Wear boots on your feet. If you are wearing Mao Mao's clothes, you'd better wear Mao Mao on your lower boots.