Slip-on flats or sneakers are the easiest to remove when you have to go through airport security. The dress may seem very impractical for airplane travel. However, it really depends on the style and the way you wear it. On the other hand, wool pants will cause you to move easily and will not force you to really feel tight around your waist.
While denim and cotton can be good in many situations in the warmer months, when the weather changes, you will find them very comfortable. Season also plays a major role in determining the type and color of clothing worn. Loose lightweight skirts or pants are more suitable because they will protect you from the sun.