Thursday and Friday I got the main pieces riveted together and the strapping prepared:
Tabs and waistband riveted together
The lined and punched tabs riveted onto the waistband.
Detail of the riveted parts
The waistband is not lined yet; that is the final step after riveting the fasteners on, so the back of all the rivets is inside the lining
Leather strapping for fasteners
Very simply: light garment-weight leather folded lengthwise, glued with contact cement, rolled flat with a marble rolling pin. They'll be edge stitched and cut into pieces for use.
(The fact that the narrower straps aren't perfectly straight isn't an issue; the pieces being used will be short enough that it will not be apparent.