noun
mercer
MUR-ser/mˈɝsɝ/
A dealer in textiles, especially fine cloth.
The mercer presents a length of fine cloth to the customer.

Etymology
The Old French word meant a shopkeeper or tradesman generally. English mercer likewise covered dealers in assorted wares, but developed the specialized sense of a dealer in textiles, especially silk.
In context
Agnes of St. Peters, a Canterbury Mercer's widow in the late 14th century, inherited her husband's shop and house directly. She continued the family business, traded textiles