This isn't ultralight, but for looking good/professional while traveling it's hard to beat.
http://www.backcountry.com/mountain-khakis-peaks-flannel-shirt-long-sleeve-mens
The Mountain Khakis Peak flannel is usually $89.95 + Shipping from backcountry.com.
However, if you ask in Live Chat for them to price match with Amazon, you can get it marked down and get upgraded to free 2-day shipping. I got a Men's Large in Navy for $29.51.
I cannot guarantee results. Be polite. I first asked if I could price match with Amazon since the Amazon seller was MK, and they said yes. Then I asked for them to match the 2-day shipping I get with a prime membership. They said sure. Now I have a travel shirt for 65% off retail with free shipping!
