I have always agreed that *conservative* styles endure longer than do directional styles. They will nevertheless become dated. I will put down a few pesos that a discerning observer could tell your 1991 Zegna suits from one bought today, although admittedly, most casual observers would not notice, nor would they care. More importantly, who cares whether your wardrobe today will pass muster in 10 years, as long as it looks good, and not tragic in today's perspective? If your particular sensibilities deem that something that is conservative is more attractive, I have no problem with that. It's the attitude that this aesthetic is inherently more valid than any other that gets my goat. BTW, if you really want "timeless", you should wear something so outlandish (say, hosen) that you'd have gotten the same reaction in 1975 as in 2004.