i prefer to the exificio boxer briefs, tighter fit which means no bunching. they are great. Also, on long haul flights I pack a tshirt and a pair of pj's to change into when on the plane. keeps the close I am wearing fresh when I get off the plane (I change back into them before landing).

i generally wear either nice jeans (dark denim) or a khaki colored cotton/denim pant, long sleeve button down, pair of loafers (love my ferragamo's), socks and might bring a blazer. Prepared for a variety of situations and I find i get better service if I look presentable (versus the vast majority of people that look like they are either at a pool party or yoga practice). It take the same amount of time to put on a pair of nice pants and a shirt as it does a pair of workout pants and shirt, so why not look nice? (open can of worms in 3... 2... 1...)

link to the type of pants. you can find them on sale for much less from time to time. http://www.neimanmarcus.com/p/7-For-...AKI&ci_gpa=pla