What's the difference between i.e. and e.g.?
late 13c., "style or fashion of attire," from Old French guise "manner, fashion, way," from Frankish *wisa or some similar Germanic source (cf. Old High German wisa "manner, wise;" see wise (n.)). Sense of "assumed appearance" is from 1660s, from earlier meaning "mask, disguise" (c.1500).