after the fashion of (someone or something)
In a manner or style imitative of someone or something else. When John F. Kennedy was president, many women dressed after the fashion of his wife, Jacqueline. I think that classical piece is after the fashion of the Baroque masters.
after the fashion of someone or something
and after the style of someone or somethingin the manner or style of someone or something. She walks down the street after the fashion of a grand lady. The parish church was built after the style of a French cathedral.