@Alex I've just seen your question about leads. Also, Yuki is looking great.
I've been using an Arctic Sammy collar and leash for Disco. Here he is modelling it by the HMAS Otway in Holbrook.

They're a small company based in New Zealand, but they ship worldwide. They use proper climbing rope and carabiners for their collars and leashes. Apparently, they have a breaking strain of 500 kg, but that's when the fittings will fail.
I've got one of their Martingale collars, which tightens up to a point to prevent it slipping over the dog's head; a standard dog leash; and one of their hands-free leads, though I haven't used that too often yet. The carabiners on the leashes are large enough to clip onto the handles, so I can wear it around my body like @Aetas does.
If you do decide to order, they regularly run sales with 15% to 25% off, and there are various influencer discount codes floating around. I think that tails15 will get 15% off.
Another company to look into would be Haqihana, who mainly make harnesses for sighthounds. I've got a Harness 2H for Disco. The third set of straps is designed to stop him from escaping from it.

The harness uses a thick and soft webbing, which is definitely nicer than what you'll find in an average pet shop. They don't impinge the movement of the dog's forelegs and chest, unlike some of the no-pull designs that can cause problems. Oh, and they're made in Italy.
I haven't seen the matching leashes, but the harness is well made and I'm trusting they wouldn't disappoint.
I found a couple of places selling Haqihana products in the UK.