Grab the Brass Rings
Unless you live near an extraordinary hardware emporium, it can be a challenge to simply pop into a brick-and-mortar retail shop and leave with non-clip unlacquered brass curtain rings in hand. I did the field research. Other supplies, like drapery hooks, I found at a neighborhood fabric store but on the ring front it was clips, clips, and more clips.
If I had not stumbled upon a great stash of chunky vintage rings at Etsy, I was headed to Restoration Hardware. (In an unfortunate turn of events, my fellow intown Atlanta residents and I -- typically spoiled by all the nearby city shopping -- lost our neighborhood RH. Now we have to trek a ways to the closest location.) Restoration Hardware currently offers double loop style rings in a variety of materials and finishes, and although I didn't intend for this post to sound like a review, I will add that I found the salespeople to be friendly and helpful on the phone. But back to Etsy, it's a source worth remembering for old hardware and supplies. For fun, check out this antique folding engineer's ruler.