Guise

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Middle English: from Old French, of Germanic origin; related to wise2.

wiktionary

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From Middle English guise, gise, gyse, from Old French guisse, guise, vise(“guise, manner, way”), from Old Frankish *wīsa(“manner, way, fashion”), from Proto-Germanic *wīsǭ(“manner, way”), from Proto-Indo-European *weyd-(“to see, view, behold, perceive”). Cognate with Old High German wīsa(“way, manner”), Old English wīse(“wise, way, fashion, custom, habit, manner”), Dutch wijze(“manner, way”). More at wise.

guisepl (plural only)

etymonline

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guise (n.)

late 13c., "style or fashion of attire," from Old French guise "manner, fashion, way," from Frankish *wisa or some similar Germanic source, from Proto-Germanic *wison "appearance, form, manner," from *wissaz (source also of Old High German wisa "manner, wise"), from PIE root *weid- "to see." Sense of "assumed appearance" is from 1660s, from earlier meaning "mask, disguise" (c. 1500).