I really want some overtrousers with braces. I currently have some Montane Ventures but they keep slipping as I've lost some weight.

I don't want winter pants so I avoid ones with snow gaiters. The only ones that I can find that are suitable are Montane Spectra Pants or Arcteryx Alpha LT Pant.

3 season waterproof overtrousers with braces, any ideas anyone?

Dave,

 If you want to save some money, get down to your local Motorcycle dealer, they should stock wide bracers that have clamps that will fit waterproof overtrousers a treat.

http://www.outdoorsmagic.com/forum/forummessages/mps/dt/4/UTN/18203/last/1/V/2/SP/332330698585344736332

answered a similar question. Helly Hansen made some good overtrousers with braces and/or beltloops. They can often be found at very good prices in their outlet in Bicester Village.