Materials
2 balls or 35 grams for Collar A.
30 grams each for collar B and C.

Pattern 3, Buttoned-down, in Crochet Monthly, #182

Collar A: has 8 pentagons joined.
Collar B: has 10 circle shapes joined.
Collar C: has 14 triangles joined.

Some stitches used:
Collar A: chains, 4 double trebles together, 2 double trebles together, double treble.
Collar B: chains, 2 double trebles together, trebles.
Collar C: chains, picots on edge, puff formed from 3 trebles.