Ok, here you go... this is my own pattern for a basic crocheted cap, including adjustments for size and stitch variations. Rock on! See Crochet Basics for stitch descriptions and abbreviations.
Description: Simple, flexible instructions for a basic cap using any stitch design, sized for anyone in the family.
Materials: Worsted weight yarn, I or J hook.
Pattern: Instructions are for average adult/teen size fitted cap. The base is worked in dc. After working the base as described, any stitch can be used for body. Work is not turned. Change colors as desired.
Start: Ch 4. Sl st into first ch to form loop.
Rnd 1: Ch 3 (counts as 1st dc here and throughout). Work 9 dc into ch4 loop (10dc total). Sl st into 1st dc (3rd ch of ch3).
Rnd 2: Ch 3, dc into same st. Work 2 dc into next st and each st around. Sl st into 1st dc.
Rnd 3: Ch 3, dc into same st and into next st. *Work 2 dc into next st, dc into next st. Repeat from * around. Sl st into 1st dc.
Rnd 4: Ch 3, dc into same st, dc into each of next 2 sts. *Work 2 dc into next st, dc into each of next 2 sts. Repeat from * around. Sl st into 1st dc.
Successive Rnds: Continue as in rnd 4, adding 1 st to the underlined portions for each successive rnd. Work until the underlined number is 4.
**For a child:
1. Work rnds 1 - 4 (rnds 1 - 3 for an infant), or
2. Work as above substituting sc for dc (remember to adjust chs too), or
3. Work as above substituting G hook and sport weight yarn.
** For a larger head:
1. Work until the underlined number is 5, or
2. Work as above using K hook and bulky or doubled worsted weight yarn.
**For a tighter base stitch:
1. Work as above substituting hdc for dc, or
2. Work base using sc instead of dc BUT to maintain the correct size: after each round, work one round of sc without increasing, then return to next rnd as written.
The body of the hat is worked one st to a st (no increases), creating a tube. Work about 5-7 rows of dc for a short cap, 12-15 for a folded brim. Adjust if other sts will be used.
To work hat body in a simple sc (hdc, dc): Ch1(2, 3) and work 1 st into each st around. Sl st to 1st st. Repeat. Many interesting striped patterns can be achieved by alternating colors and stitches by rows.
**To work hat body in any other stitch pattern:
Once the base is complete, count the number of sts in the last round. If you follow the above adult/teen instructions, you should have 60 sts in the last round. Choose a stitch pattern that has repeating sections that go into 60 evenly (ie, a shell st repeats a shell every 6 sts, so 60/6 works out perfectly).
To make adjustments: Divide the # of sts in the rnd by the # of sts in the pattern st. Whatever is left over should be adjusted either in the last rnd of the base or the first rnd of the body.
For example: My body st pat repeats every 8 sts. 60/8 leaves 4 sts too many in my base row. I can either skip 4 sts throughout the last row of the base (spread them out so no one can tell)...OR I can work the first rnd of my pat st by working 2 sts into the same st at 4 points throughout rnd (still, no one can tell).