[ravinson]

A tailored shirt and pants, a properly-knotted tie, and a jacket that is hemmed properly doesn't restrict your motions or your thoughts.

A "properly-knotted tie" always restricts blood flow to your brain, and jackets in hot weather are ridicuously uncomfortable (particularly when you are in a hurry). You can be well dressed without wearing unhealthy, outmoded clothing.

[Lou L]

I guess we'll have to disagree on what constitutes "unhealthy" clothing. In my experience, it's usually the shirt collar that's too tight, not the tie knot. As for hot weather, there are tropical-weight wool and linen jackets, but we're not talking about working outside, are we?

Let's be reasonable--your clothing should match your job and your location. If you're pouring asphalt on a hot summer day in Phoenix, wear jeans, boots and a sleevless t-shirt.

If you're a professional however, working in an office is your primary environment. Those offices usually have climate controlled areas, and the time you spend outside is minimal. There's no excuse.