Cripes, he's just linking his free website, and it is the deep thougts section, no need to be related to Penis Enlargement here.
Speaking as somebody who works in the corporate world, your personal grooming and clothing is very important.
Understanding how to dress well projects a lot about you to others, and a nice wardrobe is a good investment (especially suits, that figure is pretty much dead on, the best thing you can give young guys in the financial/law/tech whatever fields, anything professional related, is gift cards to places where they can shop for high end suits, the expense can intitially be a burden). Dressing well isn't some kind of indulgent bullshit or feminine activity, for a lot of people it's either just an enjoyable thing or a professional necessity.
And as far as the attractiveness thing, if you take a snapshot of your average joe in a well proportioned suit or in a pair of generic baggy cargo pants and some standard t-shirt, which picture do you think most women would select as the more appealing presentation? I don't consider myself to be an overly material person, but if I were to choose between two similar looking women, but one dressed in a flattering, classy, and sexy outfit, and the other in work-out pants and a tube-top, I'm going to gravitate towards the well-dressed woman. To me it signals maturity, intelligence, and self-respect. That may not always be the case, but I know I generally have a better initial impression of people when they're dressed nicely, and I expect many would of me as well.
Would any of us wear a t-shirt and jeans to a job interview? Of course not, you're trying to make a food impression and to show that you're capable and desirable, so you clean up. The same principle can be applied plenty of other places, and in my experience the people that understand this reap the rewards.
How you dress and what effort you make on your looks says a lot about you, and I generally don't care for the idea that it only says you're vain. If we are all so "non-material" and "egoless," then nobody would bother to shower, wear clean clothes, essentially do anything that makes us more socailly presentable or attractive to others. It's just a different perception and preference level for different people.