Unless you look pretty bad Reflex I'd say there's not much point, significant style changes generally make one somewhat self aware and in many cases uncomfortable - it's definitely better to be comfortable than not.

That said, if your goal is narcisstic self improvement and you don't care about potential short term discomfort then watch some girly shows and learn all about it. You'll quickly find that the advice given by stylists is identical to peacocking theory and revolves around accessories which they generally call "flair" opposed to peacocking.

The other principle that goes with this is just the concept of layering, which with a bit of experience looking through images of what is considered current good style you can quickly get the idea of.

If anything the most important thing of all is simply having well fitted clothes, not egregiously tight, not baggy.

You might also want to chill in Clothes Make The Man which is a pretty active subreddit dedicated to male fashion. There's a number of guides in the right sidebar as well as the normal submissions in the main left column.