Scotland internationalist Stuart Hogg kickstarted the campaign by gifting his time at his hometown club Hawick.
Since it launched, the nationwide charity has provided welcome packs to thousands of people newly-arrived in Scotland.
The challenge on April 28 is set to raise money for the charity Hearts + Balls which helps injured rugby players.
The bands are on sale for £2 at the Byres Road shop this weekend.
The not-for-profit group has set a target of raising £10,000.
Customers can pick up everything from Mulberry handbags to Prada dresses and much in between as part of the Autumn season launch.
The effort was co-ordinated by the charity Scottish Action For Refugees.
The former Kelvinside Academicals player, who was awarded an MBE in 2015, broke his neck in 1978 when a rugby scrum collapsed during a game against Old Aloysians.
Angela Procter has gifted the use of her family’s holiday cottage to give others a respite break.
People need to study a detailed list of items on the charity’s website before heading down.