Holy Coat of Trier and Argenteuil
The cathedral of Trier (French: Treves), Germany, and the parish church of Argenteuil, France, both claim to possess the seamless garment of Christ, tunica inconsutilis (John 19) for which the soldiers cast lots at the Crucifixion.
The Trier tradition which affirms that the relic was sent there by Saint Helena, is substantiated by a tablet of the 6th century and several documents of the 12th century.
The coat of Argenteuil is mentioned in a document dating from 1156 as the Cappa pueri Jesu (garment of the Child Jesus).
The intermingling of these two traditions gave rise to the legend that the garment woven by the Blessed Virgin for the Child Jesus grew with Him and was worn by Him during His whole life on earth.
Modern advocates of the Argenteuil tradition now claim the Trier relic is not the tunica inconsutilis but the outer garment of Christ.
The veneration of both these relics has been the occasion of many pilgrimages.
New Catholic Dictionary