ecclesiastical robe vs ecclesiastical attire

ecclesiastical robe and ecclesiastical attire both are nouns.

Word	Noun	Adjective	Verb	Adverb
ecclesiastical robe	Yes	No	No	No
ecclesiastical attire	Yes	No	No	No

As nouns, ecclesiastical robe and ecclesiastical attire are synonyms defined as:

ecclesiastical robe and ecclesiastical attire: attire that is appropriate to wear in a church

ecclesiastical robe (noun)	ecclesiastical attire (noun)
attire that is appropriate to wear in a church	attire that is appropriate to wear in a church