If you are going on vacation for 10 days how many outfits would you pack?

1 for travel and about one per day but you can wear most stuff twice depending on what you did that day and if you feel comfortably doing that. but always take one more days worth of underwear than needed.

Well, when traveling or in a vacation, it is advisable to bring only the things that you need. Of course, you need one casual dress per day. You also have to bring swimming outfit or whatever is appropriate for your vacation destination. But I agree that you should bring undergarments good for 10 days or more.