Jamieson, Fausset and Brown on John 19:23-24

23-24. Then the soldiers, when they had crucified Jesus, took his garments, and made four parts; to every soldier--the four who nailed Him to the cross, and whose perquisite they were.

a part, and also his coat--the Roman tunic, or close-fitting vest.

without seam, woven from the top throughout--"perhaps denoting considerable skill and labor as necessary to produce such a garment, the work probably of one or more of the women who ministered in such things unto Him, Lu 8:3" [Webster and Wilkinson].