Flying is not always the most comfortable experience, so when getting dressed for traveling, it's best to wear something practical. Surprisingly, many people will wear clothing that's super inconvenient for traveling. Remember, you must go through security which requires removing layers, shoes, and jewelry. Also, sitting in a small cramped space for hours and going to the bathroom on board is not fun. Therefore, comfortable clothing and shoes are always the best options.
The next time you notice flight attendants scanning you up and down, they're probably checking out your outfit and shoe choice. What they notice about you isn't limited to how you act but how also you look.