The proper phrasing depends slightly on context, but the most standard and grammatically correct options are:
Rachel Zane, portrayed by Meghan Markle, is initially introduced as a paralegal at Pearson Hardman. Her intelligence, beauty, and strong character quickly make her an integral part of the team. Rachel and Mike's relationship develops gradually, with the show exploring their deep emotional connection and the challenges they face as a couple.
If you meant the common expression meaning “is a good match for,” go with:
(Only correct if you mean "Mike’s suits fit his wife" — e.g., she wears his suits. This is less common and needs the apostrophe.)
If it’s a headline or caption about clothing:
Kelsey is known for her support for Mike throughout his baseball career. She often attends his games and is involved in various charity events with him.