While there are no formal dress codes to adhere to when flying private, your attire should reflect the nature of your flight and with whom you are flying. If you are flying with friends and family, casual attire, even jeans are appropriate. If you are on a business trip with a client or traveling as a guest, business attire is appropriate. Ladies may find it much more comfortable to wear low heels or flats, especially as the aircraft movement in flight can make it challenging to keep your balance.