How do you actually judge fabric quality online before buying?

I’ve been trying to shift my wardrobe toward more natural, breathable fabrics lately. But I keep running into the same problem. Everything looks good in photos and descriptions always sound convincing but when it comes to actually understanding fabric quality, I feel like I’m guessing half the time. Some cotton pieces feel amazing and last for years, while others feel thin or lose shape after a few washes. Same with linen. Sometimes it’s structured and durable, other times it feels too fragile for regular wear even when the listing looks identical. I had a similar experience looking at a Bangkok dress style piece recently where the design looked consistent across sellers. But the fabric descriptions varied so much it was hard to know what I’d actually receive. One thing I’ve started doing is asking sellers for fabric tag photos or short clips showing how the fabric moves. It helps a bit for understanding thickness and drape, but not every seller provides it. So I still end up uncertain sometimes. I even browsed Amazon, Ebay and Alibaba to compare how different suppliers describe similar materials. For those of you who shop more consciously, what’s your process for figuring out if something is actually worth adding to your wardrobe before you buy it?