Internationally operating apparel retailers are expanding throughout Europe (Noordhoff et al, 2004; Seock and Lin, 2011). To be able to cope with the fierce competition in the apparel retail industry, many retailers have implemented loyalty cards in order to keep current customers. Several retailers have opted for a global marketing strategy which includes implementing loyalty cards with the same features in several countries (e.g. Hunkem?ller, Promod, Esprit). This research is a comparative analysis of young adults, aged between 18 and 30, from a Northern European country (Germany) and a Southern European country (Spain). The objective is to determine if there are significant differences in attitudinal and behavioural patterns, as well as in preferences regarding the features of loyalty cards in the consumers of the two countries, to find potential success factors for retailers. In the first place, international apparel retailers have to decide which marketing approach they intend to follow. This may be either a standardised, etic marketing approach, which aims to have one overall marketing strategy for all countries, or a non-standardised, emic marketing approach, which aims to adapt the marketing strategy in every country to the local culture (Trommsdorff, 2009; Solomon et al, 2002). Research of consumer behaviour has shown that consumers are influenced by external stimuli (political, economic, social, technological) and consumer characteristics (cultural, social, personal...