Courtney Lewis, 14, made her design come to life as a gift for big sis Mikayla ... sequin gown for her sister Mikayla Lewis, 18, which included a train and back jewelry embellishments.

On Feb. 5, though, the 28-year-old pulled off her greatest coup yet: selling out a sweater from Guest in Residence—her big sister's knitwear ... tapped into the '80s jewelry trend with a pair ...

There are tons of great gifts to help siblings feel excited as they're promoted to the role of big brother or sister ... This sweet pendant is a great way to get your little girl excited about ...