We all want to see more companies add extended sizes to their lines. Unfortunately, things are only slowly progressing. Swedish t-shirt company 12-Grand is encouraging you to do that with their recently launched Grand Size Challenge.

The idea behind the challenge is simple. “The Grand Size Challenge is an appeal to a brand of your choosing to extend their size range, or maybe even create a specific garment or clothing line that you would totally buy if they only made it in your size,” says 12-Grand Founder Peter Lundgren.

According to the 12-Grand website, beginning today, 11/13, you can use the hashtag #grandsizechallenge in social messages to your favorite brands to let them know you want them to offer extended sizes. Learn more about 12-Grand and their new big & tall t-shirt subscription service here.