You can use plugs from your old charger or electronics things. Preferably the twin flat plug because they have space beside the plug to cut the hole you need.

If your plug is white you don't need to spray it with white as a base, but because mine was red, i need white base before i spray it with other colour.

Spray your plug and cable tie with the spray paint.
Remember! multiple layer works better than one thick layer of spray paint.
Make sure that the paint really dries up before you paint more layers or to do the next step.

Cut a hole on the side of the plug. make sure that the hole big enough for the cable to fit.
Be careful because that part of the plug is a bit thick. Don't cut the hole to big or the small part that supposed to hold the cable might break.

Slide in the cable in the hole slowly.

You have to make sure that the paint really dry, because if it's not, the paint might scrapped off while you slide it in the hole.

Measure the cable by trying it on your wrist. Make sure you can slide your hand in and out comfortably.

Once you have the size, use the cable tie to tie the cable. Make sure that the bulging part is between the plug and the cable so when you wear it it won't scratch your hand. You can use sand paper to softer the edges if you want to.

It is used so that the cable won't slide off when you wear em.

Cut the excess cable leaving just a bit of excess after the cable tie.

And you can wear it right away!

Enjoy!