His fashion training was at London's Royal College of Art. While there, he was discovered and hired by Alber Elbaz, then working at Guy Laroche. Melbostad followed Elbaz to Yves Saint-Laurent and later moved to Nina Ricci, where he worked under Natalie Gervais. Afterwards he went to Calvin Klein before being hired by financial backer Susan Dell to design the label Phi, where he currently works. His work for Phi has been noted for its "utterly brilliant" proportions and his redesigning of staple garments. Creative director of Diesel Black Gold womenswear since 2012, overall creative director since 2013.
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