Etymology
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vestry (n.)
mid-15c., probably from Anglo-French *vesterie, from Old French vestiaire "room for vestments, dressing room" (12c.), from Latin vestarium "wardrobe," noun use of neuter of vestiarius (adj.) "of clothes," from vestis "garment" (from PIE *wes- (2) "to clothe," extended form of root *eu- "to dress."). Often also a meeting room for the transaction of parish business, and retained in non-liturgical churches as the name of a separate room used for Sunday school, prayer meetings, etc., hence transferred secular use (as in vestryman, 1610s).
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*eu- 
Proto-Indo-European root meaning "to dress," with extended form *wes- (2) "to clothe."

It forms all or part of: divest; exuviae; invest; revetment; transvestite; travesty; vest; vestry; wear.

It is the hypothetical source of/evidence for its existence is provided by: Hittite washshush "garments," washanzi "they dress;" Sanskrit vaste "he puts on," vasanam "garment;" Avestan vah-; Greek esthes "clothing," hennymi "to clothe," eima "garment;" Latin vestire "to clothe;" Welsh gwisgo, Breton gwiska; Old English werian "to clothe, put on, cover up," wæstling "sheet, blanket."
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