As nouns the difference between sacristy and vestments
is that sacristy is a room in a church where sacred vessels, books, vestments, etc are kept sometimes also used by clergy to prepare for worship or for meetings while vestments is .
As nouns the difference between dress and vestments
is that dress is (countable) an item of clothing (usually worn by a woman or young girl) which both covers the upper part of the body and includes skirts below the waist while vestments is .
As a verb dress
is (obsolete|reflexive|intransitive) to prepare oneself; to make ready.