245 years dressing the Elegant Wizard" —Coupon for Gladrags Wizardwear on the .
Gladrags Wizardwear is a clothing store that was founded in 1750 and run by  Gladrags Wizardwear Group Ltd., with branches in London, Paris and Hogsmeade. It is full of quirky merchandise and appears to specialise in strange and unusual socks. 
[Harry, Ron and Hermione] went into Gladrags Wizardwear to buy a present for Dobby, where they had fun selecting the most lurid socks they could find, including a pair patterned with flashing gold and silver stars, and another that screamed loudly when they became too smelly." —Description.
Gladrags took out a large billboard-size advertisement at the final of the
1994 Quidditch World Cup, on 15 August.
A Gladrags coupon on the . Daily Prophet
6 March, 1995, Harry Potter, Ronald Weasley and Hermione Granger visited the Hogsmeade branch of Gladrags to buy a pair of novelty socks for Dobby's birthday present.
14 January, 1996, there was a 75% off coupon for Gladrags in the . Daily Prophet
Behind the scenes
Gladrags is a slang term for clothing purchased vintage or from a consignment shop.
Handbags and Gladrags was the name of a 1967 song written by Mike d'Abo, who was at the time the lead singer for Manfred Mann.
There is a magazine based out of India called Gladrags, which focuses on the modelling industry and the Ms. India contest.
Gladrags is also the name of a company that specialises in organic cloth feminine products.
Notes and references