This is an emphatic sentence with the usual word order changed. In English we would tend to say '(It is) Mr Lingo (who) is wearing white clothes, although we could say 'Mr Lingo IS wearing white clothes'

'Mr Lingo wears white clothes' is a more normal statement and is translated as 'Mae Mr Lingo yn gwisgo dillad gwyn'

The Welsh could also be translated as 'Mr Lingo is wearing white clothes' but without the emphasis.