Good Questions: Non Upholstery Weight Fabric for Chairs?

Hi Apartment Therapy — I just got my hands on a couple of old chairs that have sat stored away in my parents' attic for the past few years. The chairs are probably about 30 years old and they're in need of some TLC, including re-upholstering. Having done quite a bit of fabric searching online and in/around NYC, the fabrics I'm most drawn to are not upholstery weight. Unfortunately, conventional wisdom (confirmed by a great sales associate at Perl Soho) leads me to think that using non upholstery-weight fabric risks serious wear and tear. That said, looking around AT, it seems like many people have no qualms with using lighter-weight fabrics on certain pieces of furniture (look, you even used a skirt!). Note that each seat cushion is about 26" x 26" and the chairs will see infrequent use. So, here's my question - Is it fool-hardy for me to attempt to use non-upholstery weight fabric for my chairs? Thanks! Amit

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Who has advice for Amit?