What is the process of reupholstering furniture (e.g. sofas and chairs)?

We own Chinese antique-styled teak furniture finished with green silk. Over the years, the silk has gotten worn in places. Who does one approach for an upholstery job? How much would one expect to pay (ballpark, obviously) for reupholstering a sofa, two chairs, and two ottomans if using silk? Thank you for your time.