Women's suit jacket 18/20*?

Very vintage Damon brand ILGWU no size tag 😕 I'm sure it was part of a 2-piece. to me it looks like 18/20. The multi-colored shirt is a Faux shirt, it's like a dickey & is removable with snaps. kerchief is sewn in. Snap at top- threads are loose small spot on back (last pic) pretty good condition for age.