Too much... I have a walk in wardrobe and another wardrobe in my spare room.
I have shirts for work, ones I wear with suites, casual shirts, going out shirts.
I have a range of colours of polos in a range of different makes.
Yes I have stuff that's still have labels and in bags and I have brought stuff only to discover I've already owned that item.
My only excuse is that I've not really changed size since My early 20s, and I don't get to a chance to wear much of it, so they don't get a chance to get worn out. It's normally shirt/tie/trousers at work and straight in to PJs when I get home, often it's trackies or combats with polo when I'm not at work and out and about. I have a massive trainers collection too.
Yub I'm a male shopaholic...
EDIT: I did recycle 4 bin bags of clothes over a year ago.