An Etymological Dictionary of the German Language/Fitze
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Fitze, f., ‘knot of yarn, skein, wrinkle,’ from MidHG. vitze, OHG. fizza, f., ‘a number of reeled threads tied together, skein, yarn’; akin to OIc. fǫt, ‘clothes,’ MidHG. vaȥȥen, ‘to dress,’ root fat, fet? ‘to spin’? ‘to weave’?. Yet it is more closely connected with OSax. fittea, AS. fitt, ‘chapters, divisions in poems.’