But first, the query. Is there an official name for this nifty fabric trick? (yeah, I know I could spend ages with a stack of library books on fabrics, looking it up, but you guys are SO handy and greater founts of knowledge and fabric miscellanea than any ol' book ... plus one has to know the NAME of a thing to use an index or a Google search).
P.S. Pictures 3 & 4 have the most accurate colour.
EDIT: I'm adding this link to a piece of illusion knitting, which operates on a two-colour ridge construction which is similar to the non-satin sections of the vest fabric. Now, try to use your imagination to picture a multi-coloured design stamped onto this knitting, which further disguises the "illusion" (and completely hides the stripes) from some angles, but allows it to show at others.