This thesis examines the legal boundaries of third-party use of trademarks in the European customized clothing market. The purpose is to determine under what circumstances third parties may legally modify and sell trademarked apparel without infringing on trademark rights. The study employs a legal dogmatic method, analyzing EU trademark law, case law, and legal doctrine to clarify the scope of exclusive rights and their limitations. By analyzing key EU case law, the study further illustrates how the legal framework has been interpreted and applied in cases concerning third-party trademark use. Given the increasing demand for customized fashion and the rise of new business models in the clothing industry, this topic holds significant legal and economic relevance. Additionally, Schumpeter?s theory of creative destruction provides a theoretical perspective on how trademark restrictions impact innovation and market competition.

Inledning: Som svar p? den l?nga traditionen av mejerikonsumtion producerar varum?rket Oatly alternativa produkter framst?llda p? havre (Oatly, u.?). I ett samh?lle som k?nnetecknas med h?rd konkurrens mellan f?retag och ett marknadsf?ringsklimat med medvetna och kr?vande konsumenter ?r det sv?rt att sticka ut och positionera sig (Hamzah et al, 2014). Oatly anser sig vara en drivande akt?r (Oatly, u.?) i debatten kring mejeriprodukters klimatp?verkan och har en m?ls?ttning att f?r?ndra beteenden i syfte att minska konsumtion av dessa produkter.