Knit your own Ribbed Diamonds Man's Vest using these clearly-written instructions by knitwear designer Jackie E-S of HeartStrings FiberArts.
Ribbed Diamonds Man's Vest is a handsome V-neck pullover vest in a clean-cut textured pattern stitch. Knitted circularly with no seams to sew.
Preview sample cover page

3 sizes, 39(44 ½,50)". 900(1025,1150) yards sportweight yarn, 5 ½ stitches/inch, size US 4 / 3.5 mm needles suggested. Shown in cottton/wool blend. Charted instructions.
Annie H. in Georgia writes --
I am merrily knitting away on the Ribbed Diamonds Man's Vest. What a marvelous pattern! Enough patterned knitting to be interesting, but such a well designed pattern that it can be carried around, too! I love how the pattern comes right up from the ribbing and how the V neck follows the Vs in the pattern. And I love that each pattern change has a 4 row repeat for mindless knitting. It's a joy to knit. Thank you so much.