Loom Knitting Brim Hats can have finished brims as some patterns, for the ease of beginners may not finish the beginning round to be pretty.
The trick is to get started and the number of rounds you do, the thicker the brim will be. So if you don't want a huge brim but just a finished edge, try just doing 4 or 5 rounds.
I have found with kids, 13 rounds is a good number before flipping beginning back onto the loom. For adults, approximately 17 rounds. You will know what is right for you.
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