For my latest project (1/32 Hasegawa BF109 G6) I ordered some RB Productions fabric belts. If you haven't heard of these, I highly suggest you look them up. They are stunning. For a little over 3 euro (and very reasonable shipping) you get a set of PE buckles and a couple of laser cut coloured paper sheets. Assembly is tricky - because they are assembled like real belts - but the result is perfect. You end up with a set of real scale belts, not something standing in for belts. The only criticism I can think of is the lack of stitching detail.
They make two types of Luftwaffe belts as well as IJN and USAAF belts.
Here is a pic from the website:
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