According to Cinema Review, costume designer Pamela Withers wanted to give Lopez's character, Mary, a "classic beautiful look" in "The Wedding Planner."
"[Director] Adam [Shankman] and I saw Mary's style as very sophisticated, conservative and timeless, like such everlasting icons as Audrey Hepburn, Grace Kelly or Jacqueline Kennedy. Mary also seemed like a woman who saved her money and invested it in a few good designer pieces," she said.
For that amazing meet-cute scene, Withers took color and style into account.
"For instance, in the scene where Mary and Steve meet and he rescues her, she's in bright blue and tan, and he's in navy and chocolate, so they compliment [sic] each other," she said.
Lopez's sleek pony and subtle makeup added the perfect touch.