Stand collar with bow or Tie stand collar

This collar suits frocks and shirt blouses. It looks nice if stitched with free flowing fabric. Interfacing if not needed
A-B = Half of neck line
Draw perpendiculars from A and B
A-E =B-F =1½”.
Join E-F and produce till C such that B-C =F-G = 15” or to taste.
Produce C-G to H such that C-G =G-H Produce B-C to D such that C-D =2”
Shape the curve F-H as shown in the figure.
Join D-H.