The difference between Dalmatic and Sakkos
When used as nouns, 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, whereas sakkos means a richly decorated vestment worn by orthodox bishops, instead of a priest's phelonion (chasuble in western church).
check bellow for the other definitions of Dalmatic and Sakkos
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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.
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Sakkos as a noun (Eastern Orthodoxy):
A richly decorated vestment worn by Orthodox bishops, instead of a priest's phelonion (chasuble in western church).