Well, you didn't provide any information on your hardware/OS, so I can only tell you what solved a similar little problem that I had.
I've never seen exactly what you seem to be experiencing, but I did have "flickering" rigging and other small/thin details once upon a time.
I found the answer in the SH4:WoP forum; there's a stickied thread there concerning NVIDIA settings for SH3/SH4. Whether you have an NVIDIA graphics card or not, maybe the information in that thread will help lead you to find a solution.
Good luck...sink 'em all.
