Favorite Hat

This was the first hat I made this winter. It is also a new pattern. I had this pattern picked out several years ago but each time I tried it it wouldn't turn out right. After a few years of other projects I decided to come back to this and tweek the pattern to my liking. Mary has successfully made my pattern so I assume its free of errors, but if you have any questions send 'em to me!
Enjoy!!
chain 4, slip stitch into 1st stitch to make a circle
Row 1: chain 3, 13 double crochets into the circle, then slip stitch into the top of your chain 3 to pull it together
Row 2: chain 3, 2 double crochets in each of the stitches around the hat (should double in size) slip stitch in top of chain 3 to pull together
Row 3: chain 3, 2 double crochets in one stitch, then one double crochet in the next, continue this pattern all the way around and slip stitch into your chain 3 at the end.
Row 4: repeat row 3
Row 5: chain 3, 2 double crochets in first stitch, one double crochet in the next 3 stitches, repeat and slip stitch into top of chain 3
Row 6 : repeat row 5
Row 7: chain 3, 1 double crochet in same stitch, skip two stitches, 2 double crochets in next stitch. repeat around and slip stitch into top of chain 3.
Row 8-12: repeat row 7
Row 13: single crochet in each stitch around and fasten off