I'm aware no one asked, but I do want to bring up the question of "you gave the resource and instructions, but I don't have a sewing machine so I can't make this!"
A lot of my sewing is done by hand, and often wonderfully portable! When I'm on campus, I have a small pouch with some materials and tools on hand for long breaks, let's have a look.
These are the very basics I always carry
-my threads, and a cake of beeswax if I'm bringing cotton, silk or linen threads. I enjoy using cotton threads if only because polyester thread, being completely synthetic is not my jam. These are from Gütermann, the orange border denotes cotton thread, the pale yellow is polyester (which I'm using only because the store is all out of white cotton threads), and not pictured is bright yellow for linen and light blue for silk. I believe green is for top stitch, gray for upholstery; but I may be wrong.
-some thimbles, an absolute necessity. Depending on the types of stitching, you may need more than one. The black one you see is actually a leather sashiko thimble which is worn like this:
-needles! I have them in little polypropylene tubes, sorted by type and function. One holds my wee tiny no. 10 sharps, one holds my sashiko needles and the last holds some thicker needles to repair my father's workwear. You can use small glass tubes with cork caps, but I use what I have for now.
-a seam ripper. Little guy often goes missing, so I also own a ring cutter, which is a ring you wear on your index finger on your non-dominant hand to cut threads with.
-small scissors. These came out of a first aid kit I used to carry, but their small and wonderfully portable size makes it easy to carry, and is quite sharp - it's meant cut the gauze dressing for your wound quite cleanly after all.
Bonus mentions to my two cards of sashiko threads, and the little needle threader that I have but never use.
You may want to carry fabric marking supplies like a small pencil and tailor's chalk, but I often leave them out because I tend to cut my fabric at home. I don't often carry pins with me unless I think I need it, so that's also something you can consider.