Photo By Nordstrom/Trunk Club

Not Packing Appropriately for the City You Are Traveling To

According to a Trunk Club survey, 21% of travelers have to purchase an item while on their trip because of "feeling out of place in the clothing they packed." Look at dress codes at the restaurants where you plan on dining and pack at least one dressier outfit for unexpected invitations. Remember that many religious sites require more coverage than most tourists are used to, especially in the summer, so also take those sorts of strictures into consideration.