Materials

Yarn - (I use Wonder Woolen by Fleece Artist) it is about 1/8 of an inch, medium weight. You can use whatever yarn you want

Crochet Hook - I used a 4mm but you can use whatever hook you want

Needle, Scissors and Thread in a matching colour

Baseball Cap that fits you

Gauge Swatch (not necessary but if you want to copy exactly what I did then here it is)

Measurement: 2 inches across the circle (unstretched and unwashed)

(I am using American Terms)

ch - chain

dc - double crochet

slst - slip stitch

inc - double crochet increase

dec - double crochet decrease

Head Dome (make 1)

Essentially you are making a circle large enough to cover the curved part of the hat. I ended up making my circle 5 rows of increases before I did regular dc rows but I suggest following the diagram (video tutorial goes into more depth)

ch 3, slst in first ch to create a loop (you will be crocheting into this loop)

row 1 ch3, dc12 into the loop you just created, slst into the top of the ch3

row 2 ch3, inc in every stitch around the circle, slst into the top of the ch3

row 3 ch3, (dc1, inc) repeat all around the circle, slst into the top of the ch3

row 4 ch3, (dc2, inc) repeat all around the circle, slst into the top of the ch3

row 5 ch3, (dc3, inc) repeat all around the circle, slst into the top of the ch3

row 6-9 ch3, dc around circle, slst into the top of the ch3

Brim (make 1)

Ch the length of width of your baseball brim (before it starts curving) It was 12 chs for me. (I would recommend working smaller, it can always stretch)

row 1 ch2, dc to the end of the ch (12dc for me), add 3 dc into the last st (so theres a total of 4 in the end ch), dc on the other side of the ch until you reach the other end, add 3 dc into the last st, slst into the 1st st

row 2 ch 2, dc to the other end (14dc for me), dc inc in 2 sts, continue to dc to the other end (14dc for me), dc inc in 2sts, dc 1 then slst into the 1st st

row 3-5 ch2, dc around, slst into 1st st

the corners (row 1) ch2, dc until you fill that gap (9 for me) turn

the corners (row 2) ch2, dec, dc (5 for me), dec

(I know this is confusing so please watch the youtube tutorial)

After you make the Head Dome and Brim I would highly recommend washing the piece (you can always wash it after you attach it but I find it easier to do before)

After all that you can sew both pieces to your baseball cap, I suggest just sewing it to the top layer of fabric because shoving a needle through a baseball cap is difficult (I show you how in the youtube video)