This is a remix of my previous remix of laird's watch strap and Lindsay Fowler's buckle. I added a latch and I used a piece of 1.75mm filament for the pin on the buckle.
I have clipped my 20mm wide strap to 18mm. It's still 1mm thin.
I refer to my previous 20mm version for printing suggestions. The pictures show the strap being printed at .2 mm layer height. Make sure in your slicer that the filament loops around the pinholes.
See here: https://www.thingiverse.com/thing:2867440
Contrary to what you can see in the picture from my Slic3r software you need to have 0 infill and make sure that your print quality ends up containing only two layers for the strap thickness wise. I have found that using infill or more perimeters will result in a very messy print with flexible filament.
Personally I'm very pleased that the texturing worked out this well. The black filament is nice and glossy, which makes it hard for me to get nice pictures of the texture but hopefully you can see the difference between a smooth strap and the one with texture added.