I've tried to convert tannenbaum's stuff from V4/M4 and it never works as intended. After going through the process of RSSY's converters, I can get the cloths to fit G8.1 figures, but they won't autofollow and the props never work right, including most of the clothing props (like belts, insignia, etc). Boots are also a problem. I'd give 1000 points for each successful conversion of tannenbaum's WWII outfits (full uniform assets, not products like gasmask or trench coat, which I can convert using RSSY).
https://www.renderosity.com/marketplace/vendors/tannenbaum