No one sells more clothes to millennial online shoppers than Amazon. According to Slice Intelligence, the online marketplace saw 16.6 percent of revenue came from those ages between 18-35. That's more than Nordstrom (8.1 percent), Old Navy (5.1), J. Crew (4.2) and Victoria's Secret (3.6). A Morgan Stanley AlphaWise survey last fall showed that 56 percent of people said they had purchased clothing on Amazon in the past six months.