While in NZ in December, I came across a travel magazine with an article about the Camino. The article started off, 'But first, buy a pack of lady's stockings.' Apparently you wear the stockings under a pair of socks, and hikers swear by it. Anyone heard of this?
I read the same article, and thought the person who wrote it probably hadn't walked a whole Camino. But I digress.
The thing with blisters, I believe, is to take more of a holistic approach. You will be on your feet for a really long time, a month or more - your feet need to be looked after.
One thing alone is not likely to prevent them getting blisters.
You need shoes that fit your feet well, with plenty of room width wise for your feet to swell, and long enough that your toes won't hit the end, and damage your toenails. Walk in them before you go - make sure they are completely comfortable and nothing rubs.
You need socks that work for your feet. There are lots of different options, socks with or without toes, different technical fabrics, Its a personal thing. Again try them out first.
Treatment for blisters, because it is likely that whatever you do, you may still develop some. Just sheer time on your feet, day after day , rain in some months, and if you walk in summer months - heat. Best not to try a new product on a Camino. Spain is a modern country and has shops. Yes there are pharmacies - it took 4 days to find one that was open. The problem was when we found a pharmacy, it was closed for siesta, when we walked to the next town, there wasn't one.
And take something that you can walk around in after the walk, to let the air around your feet, and keep them cool, flip flops, whatever works for you. You don't want to be stuck in your shoes/boots once you've finished walking for the day.
I would say try out the tights idea - personally I found they made my feet really sweaty, which wasn't pleasant, and I ditched them long before I found out if they would work.
Trialling with a decent length walk on two consecutive days if you can, is a good idea.