Alexander McQueen One-Button Jacket, £1,099
Harrods, harrods.com

The only place for great customer service in London is Harrods. Yes, it’s touristy, but its staff is perfection at walking you through a challenging purchase, like buying jeans or bras. Plus, they carry every designer in the world. – By Justine Fairgrieve, CEO of RelativeMO

87-135 Brompton Rd., 44-207-730-1234, harrods.com