I'll join in on this one -
Suits : I vary between two ends of the spectrum on this. At one end I have my suits handmade by a fantastic local tailor. The guy's been making suits for 50 years and he's superb, although you do pay for the privilege. However, if I know I'm just going to be shining a seat in the office for any length of time I tend to wear £200 suits from M&S. I choose M&S because you can mix and match on sizes of jacket and trouser (so no adjustments needed) and you can buy 2 or 3 pairs of trousers with the jacket to cut down on excessive wear. Plus the quality is pretty good for the price.
Dress shirts : Charles Tywhritt or TM Lewin generally, although I also have a number by Blazer and a few Van Heusens around too. Usually double-cuff (although I've started to avoid them more recently on account of the cuff-links occasionally scratching my watch bracelets!
), removable internal brass collar stiffeners, never button-down collars to the office(!), no breast pocket (exactly as a good dress shirt should be! 
).Dress shoes : Leather, black, shiny. That's about it really. I don't have a lot of interest in dress shoes other than they need to be smart.
Ties : Silk - don't care about the make.
Casual wear : Always generally jeans. No specific brand although they always tend to be fairly expensive, but that's not by choice per se - I just buy what I like at the time.... and unfortunately I seem to have reasonably expensive taste. I'm generally a shirts guy as opposed to a t-shirt guy. Again, no specific brand, but a lot my shirts seem to be by smaller English and Italian designers, along with the likes of Paul Smith, Hugo and RL. I basically buy what I like as opposed to a specific brand, and because of the places I shop at, they tend to be more on the expensive side. In terms of casual footwear I'm always in leather boots or shoes ; never trainers unless I'm in the gym. Again, no specific brand here, just whatever catches my eye, but again they are always usually decent quality.
Casual jackets : Bit of a coat/jacket fetish here! I've currently got well over 20 of them. (Hey, this is freezing England after all!). All sorts - numerous leather jackets by numerous makers, other non-leathers by Hugo, RL, Superdry, FC, etc, plus a couple of off-shore sailing jackets, 3 ski jackets, a long black cashmere overcoat, even a couple of vintage Levi denim jackets, etc - loads of them.
Sunglasses : Currently 6 pairs of Oakleys and 1 pair of Ray Bans. I love sunnies and my Oakley collection was around 15 pairs at one point, but I recently sold a load off and replaced a couple of pairs to bring the total down to what I have now. While I had them in the past, I now steer well clear of any of the seriously loud Iridium lenses - Fire, Ruby, etc - as they just seem a bit chavy nowadays, especially when you aren't 18 years old any more! IMO black iridium, VR28, bronze polarised, etc, is the way to go - much more understated and cool.
Oh and I don't give a damn if my shoe leather colour doesn't match my belt and/or watch strap!
