Katy Perry stepped out in London on Thursday wearing a dress similar to the ASOS Fluffy Sweater Dress ($38.11), a pair of Dr Martens Purple Velvet Castel Boots (£95.00), black Ray-Ban Original Wayfarer Sunglasses ($155.00), a black knitted beanie similar this one from Amazon ($2.95), a studded leather Valentino Rockstud Bracelet ($345.00), a set of black gummy bracelets like these from Amazon ($7.99), and a backpack from House of Holland (not available online).