A beginner's guide to crochet a double loop infinity scarf. Step by step instructions to make your own crochet chunky infinity scarf. This video will show how to crochet a basic double loop infinity scarf! The yarn used is from Loops & Threads. It's called Charisma. Size 5/Bulky yarn with 11.50mm/P hook. You'll also want to have scissors and a yarn needle handy.