The ad blocking hype has brought new challenges for fashion brands to be seen and heard. Therefore new marketing strategies have to be found. Since the usage of mobile devises increased and consumers spend more time on online social networks - influencer marketing had been found as a authentic marketing channel to reach the consumers. Therefore this thesis aims on providing fashion brands a guideline of the components and characteristics of influencer marketing. To accomplish this research objective the qualitative method approach of expert interviews had been chosen and four experts from the fashion influencer marketing were questioned about their daily work with influencers to elaborate their needs and the challenges they are facing. The interviews lead to four core components of influencer marketing: authenticity, long-term relations, co-creation and micro-influencers. Underneath these core components the following sub-components were found: brand fit, exclusivity, visual language, passion, trust, price, creative freedom, and frequent communication. The main conclusion of this study is that working with micro influencers is key a component of influencer marketing. These influencers tend to have high authenticity, are experts in a certain niche and are not motivated by monetary reasons.