|Noah Webster's Dictionary|
(a.) Without a seam.
Int. Standard Bible Encyclopedia
sem, sem'-les: The coat or inner garment (chiton) of Jesus is described in John 19:23 as "without seam" (arrhaphos), i.e. woven in one piece.
Seamless (1 Occurrence)
John 19:23 The soldiers therefore, when they had crucified Jesus, took his clothes, and made four parts, to each soldier a part, and the body-coat; but the body-coat was seamless, woven through the whole from the top. (DBY YLT NAS NIV)