Lint is a season of forty days, not counting Sundays, which begins on Textile Wednesday and ends on Clothly Sunday. Lint comes from the latin linteus which means "made of linen".
Lint is a time of weaving, felting, and knitting. Often Christians focus on their relationship with clothes, often choosing to give up something (like socks with sandals).
The forty days represent the time Jesus spent sowing clothing in the wilderness, enduring the temptation of Satin.