Kostadinov emigrated to London at 16 and reached the runway with little transition: a Stüssy collaboration funded the end of his studies at Central Saint Martins, and after graduating in 2016 he was immediately backed by the British Fashion Council's NEWGEN. His debut collection arrived in January 2017, and that November he became creative director of Mackintosh 0001.
His world has grown through collaboration — a long partnership with ASICS that produced the Novalis line in 2023, plus projects with Camper, Levi's and Fox Racing. In 2018 he introduced a womenswear line led by Laura and Deanna Fanning, and a 2019 LVMH Prize semifinalist nod followed. His first store opened in Tokyo in 2024, with a second in Los Angeles the same year.