i am making lace sweater in round. have split at armholes and completes back to collar edge castoff
now working the front to neck split. it's eventually a three button split to traditional shirt collar the button hole area is a stitch pickup along both right and left split edges of 1x1 rib 1 1/2 inch wide. they then overlap at the bottom of the split. the decrease calls for 9 stitch at center, then 9 more on either side graduating down to 3 sts once and 2 st once and 1st once.
it seems like an opening of 27 stitches at the bottom of the split, as called for, will be so wide the button hole section won't overlap.