I made this adjustable paracord watchband with the similar weaving method to the paracord pouches/sheaths that I made, with the common basket weaving pattern.
This example is just a rough draft and can use some tweaking to improve it, but I still like the overall outcome.
I took the buckle off an old leather watchband and added four 1 ft long lengths of gutted paracord. I attached the paracord pieces to the buckle, with needle and thread, by sewing the end of each in a small loop around the buckle end.
I used a longer 7 or 8 ft long length of gutted paracord to do the over/under weaving around the four strands. I stopped when I ran out of paracord, then trimmed and tucked the ends. The ends can be sewn in place to further secure them. A short gutted length was used for the tucking band, made by tucking one end into itself and sewn together. It could be sewn in place on the watchband, but I left it free floating to slide where I needed it.
The band is not as long as I'd like it, so I'd use longer lengths of cord for further attempts. I didn't measure out the longer length before I started, so I haven't narrowed down how much is needed for a specific woven length. It's a tight fit for the paracord between the watch and pins. After I made the watchband, I removed the watch pins from the lugs, laid the band over the watch, and reinserted the pins to install the band. The watch stays in place on the band.
I would further secure the cord in the areas where the buckle pin comes through the paracord when sized around the wrist, to keep the cord from being pushed/pulled/stretched out around the pin. I need to get some heavy duty thread or possibly a kevlar sewing thread, which would be stronger and more durable than regular cotton/polyester thread.
My Timex Expedition Field Watch served guinea pig duty for this project, and a Suunto Clipper Compass(luminous/glow-in-the-dark) was also attached to the finished watchband.
And it can be worn alone, as an adjustable paracord bracelet...
A two-toned version, shown with green over tan paracord.