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.
Webbing you will need for different sized collars:
Extra Large: 1" wide webbing, a 12" and a 35" piece, loop overlap: 3" (Fits neck size 23"-31".)
Large: 1" wide webbing, a 12" and a 29" piece, loop overlap: 3" (Fits neck size 18"-26".)
Medium: 1" wide webbing, a 12" and a 24" piece, loop overlap: 3" (Fits neck size 15"-21".)
Small: 3/4 wide webbing, a 9" and a 19" piece, loop overlap: 2 1/4" (Fits neck size 11"-15".)
Extra Small 5/8 wide webbing, an 8" and a 17" piece, loop overlap: 2 1/4" (Fits neck size 9"-12".)
I created an additional size for large puppies that are too big for a small, but swim in a medium. I call it a "smedium" (small-medium): 1" wide webbing, a 11" and a 21 1/2" piece, loop overlap: 3" (Fits neck size 14"-18.5"
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The PayPal button is down at the bottom of the page. Thank you!!!