For detailed pictures of orignal items, see Paolo's threads at Wehrmacht Awards Forum
. There are several good paracadutisti threads pinned at the top.
Finding a decent reproduction uniform is hit or miss. The only good source is Sartoria Equipe
. However they are tailor made and therefore pricey (but excellent quality and correct).
Trolling Ebay is your best bet. The older Chen uniforms were pretty good (good enough for reenacting), but they don't show up for sale that often. None of the new stuff coming out of China is any good. The main problem is the wool color. Sartoria Equipe is the only current source with the correct wool.
If you haven't joined, Comando Supremo
has a reenacting section. There are several members who reenact paracadutisti.
Please note that there are several different RSI paracadutisti units, each with slightly different insignia. You need to do a bit of research and decide which one you want to do.
If you have any questions, please ask.