3.5mm (U.S E-4) crochet hook or size needed to obtain gauge

• I used Darn Good Yarn Sport Weight Linen 2 Ply Yarn in Purple . It is also possible to get the correct gauge using a Cotton Dk yarn but the drape will be different and fabric will be thicker. I would recommend Paintbox Dk Cotton or Sirdar Cotton Dk .
• 5-10 buttons (14mm)

Gauge:
18 stitches/ 17 rows= 10cmX10cm (4X4 inch) square in half double crochet underneath all 3 loops.

Stitches and abbreviations used:
st or sts- stitch or stitches
ch- chain stitch
sp- space
sl st- slip stitch
sk- skip
sc- single crochet
hdc- half double crochet
dc- double crochet
sc/ch1/sc- single crochet, chain one, single crochet in specified stitch
hdc/ch1/hdc- half double crochet, chain one, half double crochet
in specified stitch
RS- right side
WS- wrong side
PSM- place stitch marker
RSM- remove stitch marker
In- increase