Here is my version of TNG Romulan Harness. You can make any size, but as a reference I put the numbers on pieces you have to print to make harness similar to mine (see picture). Rimulan Emblems can be found among my other designs.
To connect the pieces I used wire and then solder both ends so it won't damage the fabric you will wear under the harness (see pictures). The part which goes over your shoulder needs warming up and bending slightly (you can use hot water or hair dryer to reshape the part).
I also used 15mm black ribbon (available on eBay) and just super glue to the plastic parts.
You might have to cut some of the pins to glue Romulan emblems to the middle bit and to the belts (I simply tried to avoid to create to many parts and tried to keep it simple).
There is also a piece 'Tal'Shiar' extension which will allows to add another harness strip and If I'm correct that was a difference between Romulans and Romulans from Tal'Shiar.
If you need help with assembly please ask me - Live Long The Romulan Empire :D
Physics, 3D printing, Programming, Astronomy and Sci-fi - that's me \//