label whore
A label whore will wear multiple big name brands at once, even if it looks like a fashion explosion or a walking ad.
He wore a shirt with 'Nike', 'Adidas', and 'Puma' all on it. It looked like a logo war.
She wore a jacket with so many logos it looked like a fashion disaster.
He wore a hat with 'Gucci' and a shirt with 'Louis Vuitton'. It looked like a brand fight.