Montana neighbor: Abbr. (3)

I believe the answer is:

alb

(Other definitions for alb that I've seen before include "Long white church vestment" , "White clerical garment" , "Long white robe worn by proest" , "Priest's long white sleeved vestment" , "Long white robe worn by Christian priest" .)

I've seen this clue in The New York Times.

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