I'm hoping some people here will be able to help out.

I'm struggling with a bit of brain-fade. I'm absolutely certain that somewhere, I've read about western european, late medieval sword scabbards that are covered not in leather, but in textiles - silk, velvet, etc.

Can I remember where I read it? nope, not a hope. completely lost to my brain. And I cant find any extant examples.

So I was wondering if others can think of any examples of textile coverings for scabbards?

I want to say the sword of Sancho V had a fabric scabbard... but I could be wrong there. IIRC there are at least a few other examples though I'm not 100% on the periods.

Oakeshott, "Records ..." swords XII.6 and XIIIb.1 (both red velvet). At first glance, there are 6 scabbards in Records. These 2 covered in red velvet, 2 covered in leather, one unspecified, and one covered in leather in a post-Medieval restoration.

No surprise to see textile covered late Medieval scabbards, since there are early Medieval textile covered scabbards (wood covered in textile, wood covered in textile covered in leather, wood covered in leather covered in textile) and post-Medieval textile-covered scabbards (from about the early 17th century, they become not too hard to find - velvet is most common, so perhaps a straightforward continuation of late Medieval practice).