Hi Helen, greetings and welcome to the Forum.
Wear whatever is most comfortable for you, and bring something else with you for the Albergues, exploring town etc. In summer that would be sandals or jandals (Flip flops), now I'd personally carry a light pair of trainers.
I always used to walk in boots, but after much research - including on this forum, there are LOTS of threads on exactly this topic - I now walk in trail runners. Non gortex. They are light, comfortable, once you're sure of the fit ( minimum half a size bigger than normal!!!) you don't have to break them in, and they dry fast.
Which at the moment is super important on the Frances!!! It is WET out there!