Gift giving is an effective means to strengthen interpersonal relationships; it also may initiate and enhance customer–brand relationships. Through a field study conducted with an international monobrand retailer of beauty products, a combination of propensity score matching with difference-in-differences estimations, and two experimental scenario studies, this research demonstrates that gift buyers spend 63% more in the year following a gift purchase than a matched sample of customers who purchase for their personal use. Specifically, gift buyers increase their purchase frequency (25%), spend more per shopping trip (41%), and engage in more cross-buying (49%). The sales lift is particularly pronounced among new customers. Identity theory suggests customer gratitude and public commitment as mediating mechanisms. Gift purchase design characteristics (i.e., assistance during gift purchase and branded gift wrapping) influence the strength of the mediating mechanisms.