ukelele has covered a lot of this, and quite well. You can do google image searches for men's fashion, modified as you like (classic? vintage?). Or look at what your colleagues are wearing and see what looks like something you'd like.
If there's a particular era of clothes you like (say, the 1920s), you can look for clothes that have similar shaping and go with those. If you just want to look like a grown-up, classic business dress (or business casual, depending on your work environment) for men is pretty easy: trousers (blue, black, khaki), collared shirt (solid, striped, subtle pattern; colors you like; usually long sleeve, short depending), tie (could be optional), jacket (to match trousers). Dress shoes in brown or black.
Jeans and a t-shirt is a style, and it's pretty much always 'in'. The cut and fit of the pieces changes year to year, but most people don't pay that much attention.
I am not very good at fashion myself, but I learned some things growing up a girl with a sister who was REALLY into looking right. fashion-era.com has a lot of historical (even recent past) info, but I think it's mostly female.
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If there's a particular era of clothes you like (say, the 1920s), you can look for clothes that have similar shaping and go with those. If you just want to look like a grown-up, classic business dress (or business casual, depending on your work environment) for men is pretty easy: trousers (blue, black, khaki), collared shirt (solid, striped, subtle pattern; colors you like; usually long sleeve, short depending), tie (could be optional), jacket (to match trousers). Dress shoes in brown or black.
Jeans and a t-shirt is a style, and it's pretty much always 'in'. The cut and fit of the pieces changes year to year, but most people don't pay that much attention.
I am not very good at fashion myself, but I learned some things growing up a girl with a sister who was REALLY into looking right. fashion-era.com has a lot of historical (even recent past) info, but I think it's mostly female.
http://www.esquire.com/style/mens-fashion/
http://www.gq.com/style