Short waistcoat pattern

Well here goes .... I have never written a pattern before, but have been asked for it by a few people, so here it is.

Materials: 200g 100% cotton yarn; 3mm hook.
Garment is made from motifs which are joined together on the final round of each motif.

Abbreviations: ch = chain. tr = treble. dc = double crochet. sc = single crochet.
Notes: Cluster is worked thus: Keeping last loop on hook, 1 treble in treble below, 2 trebles in ch space, 1 treble in treble below, yarn through 4 loops on hook.
Join - make a join by working a sc in middle of chain space.
Tension: square motif is 4.5 inches across when joined. Width of back is 23 inches including folded side squares. Neck to base is 23 inches.

Motif - Square: See pic below for schematic but note that corners have 11 ch and not
Round 1: Start with yarn ring and work 2 chain, 11 single crochet. Join in 2nd starting chain with slip stitch.
Round 2: 6 ch, 1 treble in top of 1st single crochet, *3 chain 1 treble: Repeat from *. Join in 4th ch of first 6 ch, 4 chain.
Round 3: Cluster - using 4 chain start to count as 1st treble, 5 ch, cluster, 11 ch, **cluster, 5 chain, cluster, 5 chain, cluster 11 chain. Repeat from ** twice. Cluster, 5 chain. Join with slip stitch in top of starting cluster. Break off yarn and thread in end of yarn. For next motif, follow joining round as round 3.
Joining round: Cluster - using 4 chain start to count as 1st treble, 2 ch, with wrong side of first motif facing, join in middle of 5 chain space. 2ch, cluster, ***5 ch, join, 5 chain, cluster, 2 ch join 2ch, cluster, 2ch join, 2ch cluster. Repeat from *** 3 times. Cluster, 2ch, join, 2ch. Join with slip stitch in top of starting cluster. Break off yarn and thread in end of yarn.

Motif - Triangle
Row 1: Start with yarn ring and work 2 chain, 6 single crochet. 6 ch, Turn.
Row 2: 1 tr in sc below, 3 ch, 1tr to end (Last tr in 2nd chain of starting chain. 7 stitches). 11 chain. Turn.
Row 3: Cluster, 2 ch, join, 2ch, cluster, 2 ch, join, 2ch, cluster, 5 ch, join, 5ch cluster, 2 ch, join, 2 ch, cluster, 2ch, join, 2ch, cluster, 11 ch. Join with slip stitch in 4th chain of starting chain.

Edging
Starting at centre back, join yarn in centre of right motif corner.
Round 1: 2 ch to count as sc. **** 5 ch, 1 sc in centre of chain space. Repeat from ****. Work in this way all around garment. Join with 2 ch, 1 treble into 2nd of starting chain.
Round 2: Working in sc from previous round, *****1 dc, 1ch, 1dc, 1ch, 1dc, 1 ch, 1dc. sc in centre of 5ch space. Repeat from ***** to end. Join with slip stitch in joining dc of previous round. Break yarn and thread in end of yarn.

Arm hole border
Work arm hole border as edging, joining the yarn at shoulder join of garment.

Square motif schematic

work 11 chain on corners instead of 7

Garment layout schematic