First thing’s first: I am a big Gap Inc. fan. I’m of the opinion that you can fill out nearly an entire wardrobe with clothing from the company’s four brands: Gap, Banana Republic, Old Navy, and Athleta. Today though, we’re here to talk about Athleta, known for its higher-quality athleisure and workout wear. It’s a great place to shop for travel day clothing, no matter where you sit on the pajamas-to-business-casual spectrum of dressing for a flight. If you’re a sweats kind of traveler , it's got you covered (I love the Forever Fleece high rise joggers ). For something a little more put together and on trend, look to the wide-leg Seasoft mid rise pants . For something you can wear from the place into an office or work meeting, consider the Brooklyn mid-rise ankle pants .…