Probably from the same root as macveh; covering, i.e. Clothing -- clothes.
see HEBREW macveh
H5497. suth
[סוּת] noun [masculine] vesture (Late Hebrew, but dubious; see Levys. see ); — suffix 3 masculine singular סוּתֹה Genesis 49:11 (poem in J; "" לְבֻשׁוֺ).