Very nice copy of suspenders, production: "Replika". The original elastic 35 mm, neatly reproduced leather tips, manufacturer's stamp.
V-shaped model was attached to the buttons on the waist of 1940 model trousers or on straps with buttons of 1943/44 models. The length is smoothly adjusted with buckles in the color of the feldgra (RAL6006).
How to choose a size?
You need to put on the pants and measure from the buttons on the back of the pants over the shoulder and down to the buttons on the front of the pants (as the elastic band goes). The length of the suspender should be 10-20 cm longer than the measurement obtained. Please remember that the waist of the German pants is at the level of the lower rib, above the navel, it is 10-20 cm higher than jeans' waist, and for German WW2 pants you need shorter suspenders!
For example. You measured from button to button over your shoulder and got 89 cm. Add 10 cm (or more) as a margin and get 99 cm. Medium size braces (93...103 cm) will suit you.