@inspiring Yes, you can do that. I added strings for a bracelet on the sides to close mine, but if you just want the envelope you'll need to sew up the sides. Also be sure to read the first comment where I explained how to make this
To make a custom sized envelope you can add as many rows as you want to the middle section, but to add base strings to make it wider the length needs to be less than 2x the height of the middle section.
Maybe you could add like 4 extra knots over this rule but if it's too long the top flap will be too big to fit inside.
I made a new pattern #138376 where you can make the length up to 3x the height of the middle section.
( Ignore this if you just want to follow the pattern without changing the size)
I made some patterns that fit the back of the envelope (middle section of this pattern) #138114#138116 but you could also change the size of the envelope by adding more base strings and/or more rows to the middle section.
Cut 10 base strings 9" long. Make the first knot in the middle of those 10 strings. Fold the base strings in half and make the second knot of Row 1 over 10 strings. Using the shaped alpha technique continue following the pattern making sure to push your knots up to keep them in a straight line.
To make it easy to fold, loosely tie a row of half knots inbetween the separate sections. (half knot is like a FB knot but only make the F part)
Cut the strings at the bottom and glue them to the back. Let dry completely.
To close the sides, attach strings for a bracelet by sewing through the middle and bottom layer. Tie the first knots of your bracelet extra tight to make sure it closes the sides up.
