atm (& for the past 2 months+) you'd be best off with a sowester & waders tbh. British weather eh!!!!!
I love the stealth gear trousers, they are waterproof, hard wearing & really warm (too warm for the Summer months imo, but fine for the rest of the year) They have a Velcro fastening on the waist & adjustable for a good couple of inches. I think they are fairly `generous` re sizing. They do a couple of different leg-lengths too, which is good.
I don't own one of their photographers coats/jacket, so can't really comment. I already had a Harkila hunting coat/jacket, otherwise I'd probably have got a Stealth Gear one.
I bought mine from W. Slack & sons, in Mansfield Notts. After phoning & telling them my measurements, they advised which size to get.
Good luck shopping & lets hope for a Summer like last year!