"He is wearing a gray suit."

Translation: Er trägt einen grauen Anzug.

[DavidLiddell]

Unlike English, German has no "-ing" form. So "Ich esse" means "I eat" and "I am eating".
This comment has no relevance to this sentence?

[christian]

It's relevant to what you entered. You probably tried to use the continuous aspect, which doesn't exist in German. When you enter something like "er ist trägt", the above message will be displayed.

[AhmedAbdelslam]

Er trägt einen grauen Anzug an?
das ist richtig oder?