I purchased the webbing and hardware used in this video from Country Brook Design.
The pattern used in this collar is called Snowy Pines Polyester Webbing and you can view it here: https://www.countrybrookdesign.com/webbing/polyester-webbing-straps/1-inch-snowy-pines-polyester-webbing.html
The Hardware used is the 1 Inch Martingale Dog Collar Kit and can be viewed here: https://www.countrybrookdesign.com/tie-downs-cargo-straps/dog-collar-hardware-kits/kit-collar-dog-martingale-1-inch.html
I also added a “Keeper” which is optional. Here's the URL: https://www.countrybrookdesign.com/hardware/rectangle-triangle-rings/keepers/rings-rectangle-keeper-welded-lite-1-inch.html
The #69 weight bonded nylon thread I purchased on Amazon: https://www.amazon.com/gp/product/B0785J8D65/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1
And you will want to use a Denim needle size 110/18.
f you find this video helpful I would appreciate it if you would go to Motley Mutts Rescue website and make a small donation. https://www.motleymuttsrescue.com/volunteer-or-donate The PayPal button is down at the bottom of the page. Thank you!!!