But the real power of tailored clothing is that it gives you a wider range. This is, indeed, about as close as you can come to a universal babe-magnet. But you have to be able to do it right and this may require some sacrifices. The archetype here is, of course, James Bond.
There are two guiding principles. The first is context. You need to be able to dress appropriately, both up and down. And yes, this may occasionally require you to dress as a "slob." But, and here is where the tailored clothing really comes in, you also need to be able to rev it up. So you wear the t-shirt, go to the family bbq and drink beer with the cousins. But the next night, you put on a suit and go to a good restaurant. As you will be much better dressed than most of the other patrons but still perfectly appropriate, you will own the room and get treated with a surprising amount of respect by the staff. Most women, for some reason, find this combination deeply attractive.
The second principle is what I call the dog test. Suppose you are wearing a suit at a party and the family dog comes up to greet you. Let's say the greeting is on the enthusiastic side. What do you do?
If the answer is, squat down and scratch him behind the ears while ignoring the dog hair, slobber and mud that you are getting all over your expensive suit, you pass. If the answer is shy away in horror, you fail. If the answer is shy away in horror while calling desperately for someone to control this animal, you fail and don't get to take the test again.
If there is any universal principle here, it is that you own your clothes, the clothes don't own you. You use them for your own purposes. If wearing an old t-shirt is the right thing, that's what you do. If you need to scratch a dog while wearing a suit, that's what you do. This is why James Bond is James Bond and not an effete dandy.