EPISODE V: THE EMPIRE STRIKES BACK
Like many characters in Star Wars, Han wears black riding boots with the smooth dress finish.
Shown above are East German military riding boots, however Han's boots fit tighter and were taller. Most likely they were commercially made equestrian boots.
A standard military issue black belt with three sets of holes running the length of the belt.
The leather gunbelt with holster appears to be entirely custom made.
One item on the gunbelt is half of a carburetor from a Revell V8 visible engine model kit.
Two piston halves from this same kit are used on Han's DL-44 blaster.
Part #52 - Carburetor (rear half)
The item next to the model part is not yet positively identified. It can be seen in the photo below and appears to be an electronic component, possibly a capacitor.
BlasTech DL-44 Heavy Blaster Pistol