It IS true that sandals should NEVER be worn with socks, as a basic style issue. This was sternly impressed on me by several lady friends in Europe.
It is as much a fashion "no-no" as wearing knee-high socks with any footwear while wearing shorts, unless it is part of a prescribed uniform. Although the latter is seen daily here in South Florida.
That said, the Camino is NOT a fashion show. It IS a study of essential function and is "needs must" on steroids.
I started wearing sandals as my evening, apres Camino, footwear. But they did not do double duty in showers to prevent getting foot fungi...been there, done that. Better to not get it than have to treat it.
So, I then bought Crocs in a bright Wasabi green color while in Leon on my second C/F. My idea was that no one would borrow them in such a conspicuous color. They did work in the shower, and with socks outside if needed for cushioning or warmth.
But, the Crocs were not that comfortable while walking in cities, and then, there was that color... these distinctive Crocs are now my yard and garden shoes here in Florida. They are perfect for that role.
Starting at Lisbon this 27 April, my new apres Camino, all-purpose footwear is a lime-green pair of Telic expanded foam, zories, flip-flops (changlas). They can be worn with light liner socks. The socks just stretch to accommodate the toe thingie. I have been wearing them to the beach.
The color prevents them from being borrowed on Camino and they are designed as after-wear for runners. So, they are very comfortable. Check them out at
www.telic.com.
I hope this helps.