Simplify the following text for a Grade 8 native English-speaking person.
Original: Since medieval times Jersey , Channel Islands , where the material was first produced , had been an important exporter of knitted goods and the fabric in wool from Jersey became well known . The fabric can be a very stretchy single knitted , usually light-weight , jersey with one flat side and one piled side .
Simplified: Since the Middle Ages , the island of Jersey exported a lot of knitted goods ; the fabric used became well-known under the name .