Where does “slevelees” come from?

slevelees (Middle English) comes from Old English slīeflēas, from Old English lēas, from Proto-Germanic *laus.

Ancestry of “slevelees”, step by step

Step	Language	Word	Meaning
1	Old English	slīeflēas	sleeveless
2	Old English	lēas	false, lax; false, void, loose; devoid of, loose...
3	Proto-Germanic	*laus	—

slevelees — Etymology, Origin & Word History | Etymology Explorer