Summary

Lost the buckle and strap adjuster for these old overalls. Designed this buckle to be a good friction fit. I printed mine out with "Big Jim" embossed but don't worry, the STL file I uploaded is just plain! If it is too thick for your application you could always open it in your slicer and adjust the z axis to a thinner thickness.

Printed on an Ender 3 with eSun pla+, 1.6 mm walls and 50% infill.