Source: Chris Hallbeck https://bsky.app/profile/chrishallbeck.bsky.social/post/3l45pexryfw2p
Some shirts have a small micro fibre cleaning cloth (like the one in your glasses case) sewn into them.
Aren’t all parts of a shirt suitable as a cleaning cloth?
Good question! No! Most t-shirts work well, but button-up shirts are often not soft, pliable, or absorbable enough to really function well for glasses cleaning (IMO, anyway).
You aren’t likely to scratch the glasses (glass is very hard), but you kinda just move the smudges around and make them worse with certain fabrics. I want either a nice mostly-cotton blend, or a nice thick microfiber cloth (microfiber is not created equal, and some are practically useless).
Maybe I’m just picky. Your mileage may vary.
Thanks for a surprisingly in-depth answer! I very rarely wear proper shirts, which I think explains my assumptions.