Surprise Crochet Hat

This quick and easy cap will fit most adults if worked at the tension below. You won’t be able to stop at one.
The raised rib effect is created using a stitch known as raised treble front or post stitch (rtrf). To work a rtrf: wrap the yarn over the hook as if to commence a treble.
Instead of inserting the hook in the chain at the top of the treble, insert the hook, from right to left, behind the tr stitch of the previous row. Again wrap the yarn over
the hook.
Draw the hook backwards pulling the loop through. There are three loops on the hook. Again wrap the yarn over the hook and draw the hook backwards to pull the
yarn through the first two loops on the hook. There are now two loops on the hook.
Once more, wrap the yarn over the hook. Draw the hook backwards to pull the yarn through the remaining two loops on the hook to complete the stitch.
Tension:
In treble crochet 20 sts x 9 rows over 10cm x 10cm.
This cap is worked in rounds. Do not turn at the end of rows.
1st rnd: Ch 5, join with a sl st in beg ch to form a ring.
2nd rnd: Ch 3, work 17 tr in ring, join with a sl st in top of beg ch (18 tr)
3rd rnd: Ch 3, tr in joining sl st, * work 1 raised treble front (rtrf) in next tr, 2 tr in next tr, *; rep from * to * 7 more times; work rtrf in last st, join with a sl st in beg ch. (9 rtrf, each separated by 2 tr).
4th rnd: Ch 3, tr in joining sl st, tr in next tr, * work 1 rtrf in next rtrf, 2 tr in next tr, tr in next tr *; rep from * to * 7 more times; work rtrf in last rtrf, join with a sl st in beg ch (9rtrf each separated by 3 tr).
5th & 6th rnds: Continue to increase 1 tr in each group as in 4th rnd, until there are 5 tr between each rtrf.
7th rnd: Ch 3, tr in joining sl st, tr in next 3 tr, 2 tr in next tr, * work 1 rtrf in next rtrf, 2 tr in next tr, tr in next 3 tr, 2 tr in next tr *; rep from * to * 7 more times; work rtrf in last rtrf, join with a sl st in beg ch. (9 rtrf, each separated by 7 tr).
8th rnd: Ch 3, tr in joining sl st, tr in next 6 tr, * work 1 rtrf in next rtrf, 2 tr in next tr, tr in next 6 *, rep from * to * 7 more times; work rtrf in last rtrf, join with a sl st in beg ch (9rtrf each separated by 8 tr).
9th rnd: Ch 3, tr in joining sl st, tr in next 6 tr, 2 tr in next tr, * work 1 rtrf in next rtrf, 2 tr in next tr, tr in next 6 tr, 2 tr in next tr *; rep from * to * 7 more
times; work rtrf in last rtrf, join with a sl st in beg ch. (9 rtrf, each separated by 10 tr).
10th rnd: Ch 3, tr in joining sl st, tr in next 9 tr, * work 1 rtrf in next rtrf, 2 tr in next tr, tr in next 9 *, rep from * to * 7 more times; work rtrf in last rtrf, join with a sl st in beg ch (9rtrf each separated by 11 tr).
11th rnd: Ch 3, tr in joining sl st, tr in next 9 tr, 2 tr in next tr, * work 1 rtrf in next rtrf, 2 tr in next tr, tr in next 9 tr, 2 tr in next tr *; rep from * to * 7 more times; work rtrf in last rtrf, join with a sl st in beg ch. (9 rtrf, each separated by 13 tr).
12th & 13th rnds: Ch 3, tr in next 12 tr, * work 1 rtrf in next rtrf, tr in next 13 tr *, rep from * to * 7 more times; work rtrf in last rtrf, join with a sl st in beg
ch (9rtrf each separated by 13 tr).
14th rnd: Ch 3, tr in each of next 10 tr, decrease over next 2 tr, * work rtrf in next rtrf, tr in each of next 11 tr, decrease over next 2 tr, *; rep from * to * 7 more times; work rtrf in last rtrf. (9 rtrf each separated by 12 tr).
15th, 16th, 17th, 18th & 19th rnds: Continue to decrease 2 tr in each group as in rnd 14 until there are only 6 tr between each rtrf.
20th rnd: Ch 2. Dc in next 3tr, dec over next 2tr * dc in next 4tr, dec over next 2 tr; rep from * to end. Join with a sl st in top of ch2.
Visor
Worked in rows.
1st row: Dc in the next 24 tr. Turn.
2nd row: Skip the first 2 dc. Dc in the next 28 dc. Turn.
3rd row: Skip the first 2 dc. Dc in the next 26 dc. Turn.
4th row: Skip the first 2 dc. Dc in the next 24 dc. Turn.
5th row: Skip the first 2 dc. Dc in the next 22 dc. Turn.
6th row: Skip the first 2 dc. Dc in the next 20 dc. Turn.
7th row: Skip the first 2 dc. Dc in the next 18 dc. Turn.
8th row: Skip the first 2 dc. Dc in the next 16 dc. Turn.
To finish work 1 row in dc along entire edge of hat including visor.
Fasten off.
Sew in any loose ends