Intermediate, maybe advanced beginner: slipped stitches, decreasing in pattern

Chest
cm 56 (61, 66, 71, 76)
in 22 (24, 26, 28, 30)

Yarn--Cozy Soft Chunky
Color A 210 1 (1, 1, 1, 1) (contrasting trim)
Color B 310 1 (1, 2, 2, 3)