Lost luggage can ruin the start of a holiday. If you're travelling in a group, distributing clothes so that everyone has at least one complete change of clothes in each case can help avoid the risk, but the approach has downsides.
Photo by Kristen Taylor.
Redditor whedonmoffatparadigm explains the idea:
At the very least, make sure each case contains at least one complete outfit for each person. That way, if one of the cases is lost, no one will be completely without a change of clothes. If you're travelling alone and are checking a bag, take a change of clothes in your carry on, for the same reason. At the very least, take a change of underwear in your carry on.
In a sense, this means packing your bags in the style of a RAID array.
There's something to be said for this approach, but there are potentially better alternatives. I'd lean towards everyone having just one change of clothes (which needn't be more than a new shirt and underwear) in their hand luggage. That gives you options even if all the cases in a group go to the wrong location (which isn't unheard of). If you follow our advice on travelling with just hand luggage, you won't be worried about misplaced bags at all.
Also, if you're flying with a decent airline and a bag goes missing, you'll be able to hit them up for money to purchase emergency clothing and toiletries. So I wouldn't use this idea all the time, but it's a possibility, especially for families with younger kids where parents do all the packing anyway.