The difference between Chasuble and Dalmatic
When used as nouns, chasuble means the outermost liturgical vestment worn by clergy for celebrating eucharist or mass, whereas dalmatic means a long wide-sleeved tunic, which serves as a liturgical vestment in the roman catholic and anglican churches and is worn by a deacon at the eucharist or mass and, although infrequently, by bishops as an undergarment above the alb.
check bellow for the other definitions of Chasuble and Dalmatic
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Chasuble as a noun (Christianity):
The outermost liturgical vestment worn by clergy for celebrating Eucharist or Mass.
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Dalmatic as a noun:
A long wide-sleeved tunic, which serves as a liturgical vestment in the Roman Catholic and Anglican Churches and is worn by a deacon at the Eucharist or Mass and, although infrequently, by bishops as an undergarment above the alb.