I am going to be changing jobs in May, and will be leaving my current workplace which is pretty informal (jeans most everyday) to one that is a lot more formal. At this new place they wear shirts/trousers on a regular work day, but for big meetings and international travel, proper suits are the norm. The last time I wore a suit was at my wedding 18 years ago (double-breasted grey wool with 1-inch pinstripes), and that is still the only suit I own. So clearly I need to up my game a bit and get myself a few new suits.
But considering I am basically a suit novice, I could use some practical advice. What are the current styles available? (nothing too trendy please) Are certain colors/shades/materials worn on certain occasions? Are there degrees of formality? With a tie or without? And the same goes for shirts and ties, which styles for which occasions? Any Dos or Don’ts? And how often should I change my suit? If I am at a 3-day meeting, should I have 3 different suits?