"1 qm Lein" is the German and Austrian version of a Swedish project to keep knowledge about growing and processing flax alive - and to build a community around this at the same time.
The project "1 qm Lein" provides you with flax seed for one square metre, plus instructions on how to grow and later harvest the plants. And then the plan is for participants to meet up and process their harvest together - with the result being a hand-woven band or something else. (1 square metre will not be enough for a shirt, even though "shirt" is mentioned in the teaser texts. That's explained in the FAQ section. A shirt would take about 10-15 sqm, approximately.)
If that sounds like a project for you, you can find out more via the website https://1qmlein.de/ and also join in there, either as a single grower, or as a regional partner. There's also a map there, with quite a few museums, gardens and other groups. The project is open to register as participant until November 3 - after that, the packages will be packed and sent out.