10 degree can I wear a thin suit?

You can't. It's cold to wear a thin suit at ten degrees.

The outside temperature of wearing a suit is between 15 and 25 degrees. For health reasons, warm clothes are recommended. It will be a little hot to wear a down jacket or cotton-padded jacket at this temperature, but you should wear thick autumn clothes and trousers.

10 degree weather, just wear a thicker coat, such as woolen coat and sweater coat. Warm underwear should be added to the clothes of the weak, the elderly and children.