When in doubt, wear every blue item you own with your favorite blue jeans, and you have a J.Lo-approved outfit. Plus, if blue seems like a reach, this actually works with any color paired with jeans. Think, burgundy, beige, brown, black, white, etc.
On Jennifer Lopez: Max Mara coat; Valentino Medium Rockstud Matelassé Quilted Leather Crossbody Bag ($2895); Buscemi Site Boots ($995); Privé Revaux Jagger Sunglasses ($30