[pct-l] Favorite piece of apparel?

[Hollywood]

Hi All,

A friend of mine works for Columbia Sportswear and I'm going to pay a visit to their offices to talk to the trail design team about apparel thru hikers like. Ill be sharing my opinions and those of people I've hiked with, but thought I'd extend the question here. 

So, what's your favorite piece of clothing and why? Do you wish you could tweak it or is it perfect? Could be anything from head to toe, all opinions welcome and much appreciated.

Cheers
Hollywood

Note: I don't work for Columbia nor am I being compensated for talking to them, just thought it would be cool to have some thru hiker input in next year's stuff. :)