As you can see above, the offer was keenly taken up by football fans who loved the idea! We've spotted a retro Liverpool FC shirt, a Barcelona fan and a Real Madrid shirt... but what is the mysterious green and white striped shirt? Answers on a postcard please!
Harlequins Rugby League's next home match is against Huddersfield Giants on Saturday 11th July, 3pm kick-off.
There's still time to plan your outfit and book your tickets on 0871 527 1315 or online HERE.