I saw Alpaca Cowl by Barb boysandb.
I liked it a lot and wanted to make something similar.
Thanks to Ms. Barb for listing the details on how she made it.

Worked flat with button closure.
Made five button holes by working one row sc and one row sl st in same yarn as main section, US L/11 8.0 mm needle.

Patt is in multiples of 4.
CO 108 + 3 + 2 = 113
(three more stitches for ribbing symmetry worked flat.
two more for selvedge.)

Ultimo trim:
Worked main section and bind off with Ultimo, double str, US 35 19.0 mm needle so the bind off would accommodate the stretch of the rib.
Worked back across that edge with sc, ch1 with P/16 11.0 mm hook.
Worked short ends of main section with sc.
Worked cast on edge by picking up a loop and doing mock bind off, again with US 35 needle.
Worked back sc, ch1 as well.