Cleavers, stickweed, sticky willy: most of the names for this hedgerow weed point to its persistent clinginess. Mostly, plants which stick to clothing do so with hook-like attachments to the seeds. It’s a method for having the seeds cling to fur or feather and get dispersed from the parent plant.
Not this weed. It seems like very part of the overground section of the plant has a magnetic attraction to fabric. At the moment, the plant is just a few inches long. It will grow, possibly, to stretch some to three or four feet, with the leaves also elongating.