Oh, now you've got me going!
I've been through a lot of clothing, especially waterproof trousers, in the last 20 years and I like my Musto Highlands coat for Scottish hill stalking in winter. I like to wear layers under it so I can match it to a lot of weather conditions. It is good in more "formal" situations as it is just flat green.
Recently I've taken to buying military surplus gear. I bought a British "windproof smock" which is basically a cotton/poly coat with a hood. I washed in some waterproofing and was amazed that it turned an hour long downpour in Scotland in September as I didn't expect it to be anything but very light shower proof. I certainly wouldn't rely on it being waterproof though. The pockets are great, very sensible, and suitable if you are left or right handed and it stands up to abuse well. The big plus is that you can buy one and try it for not a lot of money, in fact the German flectarn versions, pretty similar from what I can see, were on ebay for £6. You can also get a goretex german flecktarn waterproof jacket for less than £15 delivered on ebay. Now, the choice of colours will be a bit limited but if you go down the route of the German flecktarn stuff you can have a good outfit for probably £30. At that sort of money you have to at least give it a try I'd say.
In terms of trousers I've been wearing the Harkila Grizzly Brush trousers for a while now and they have lasted the longest of any waterproof trousers I've ever had. Most have a life measured in days or weeks. I think they are end of line items now and can be had for about £80. Not too warm so you can layer thermals under them and despite being light I've been impressed with their robustness (if there is such a word) as I thought they would last 2 weeks max for me when I first got them. The heavy weight Harkila stuff is, well, very heavy weight and I think you'd be better with a pair of mil surplus over trousers for £15, however as you can see I'm having a mil surplus phase at the minute
The heavy weight Harkila stuff really is quality gear, though the price is very high indeed, but you would need to try it before deciding on it as it will not be to the taste of all. I'd be pretty certain it will be robust.