As I said, I tend toward conservative dress. I wouldn’t dream of showing up to work in khakis. OTOH, if I worked in, say, an up-and-coming advertising firm rather than my stodgy old profession, there might be more flexibility in dress, but as far as general guidelines for wearing a suit, I’m sticking to what I said.
Shoe trees help leather shoes keep their shape, and are essential for traveling or storage. A nicely shaped shoe of well-maintained leather will not wear out as rapidly. Your enemy is leather getting dry, cracked, and crushed. Of course, Sketchers are way more durable than most wingtips and captoes.
That last aphorism is a little joke: Accountants keep their pencils sharp, but they are pretty dull. The advice basically means dress conservatively, but focus on getting clothes that fit you. A $200 suit that is bought on sale and fits right will look better than a $1,500 Armani that’s long on the sleeves, tight on the shoulders, loose around the midriff, and falling down to your ankles.
For me, the greatest advantage to dressing conservatively is that the suits last longer. A conventional Joseph A Banks suit can easily look good for ten years, but the seven button suit that someone bought from DKNY three years ago is now starting to look kind of silly.
The color of dress shirts is a good question. I, myself, occasionally wear a bold purple shirt with various strongly colored ties, but that look is now becoming a bit dated. But I got compliments, too, when I started wearing it! Less so, now. White, most blues, and even light pink and a mild yellow are the standard conservative colors for shirts. Blue stripes are standard, too. Button-down collars are less formal, and spread collars are more stodgy (avoid them unless you have real old-school ties that feature knots the size of a child’s hand).
I, myself, don’t wear a different suit each day of the week. I’d say I have three or four suits that I wear consistently, and a couple others less so. The great thing about being a guy is that a different shirt and tie completely changes your look, so long as you’re not wearing suits that are not cut too stylishly.
I’d say men should start off with one grey suit, add a blue as soon as they can. These two suits should get you to your first raise, and then you can go into pinstripes, tropical linens, and other colors.
Oh, and GOD FORBID, do NOT keep your jacket buttoned when you sit in a chair.