All Black Everything
It is pretty common knowledge that black can make you look slimmer. However, the color also tends to wash out your complexion. Our skin lightens as we get older, so you will look more washed out the more you age. If you have a black jacket on, you should wear a red shirt below it.
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Tweed
Tweed can age even the youngest-looking person by 10 years in no time at all. It is good for kids and seniors but no one else. If you like menswear, you should wear pinstripes and houndstooth instead.