I purchased "FitFlops" on the recommendation of a friend who also had plantar fasciitis & had good luck with that brand.
There is no "breaking in" period as they were immediately worn everywhere.  I don't believe they came in 1/2 sizes so I got a 10 but wish I would have bought a 9. They run a lttle large & are a little sloppy on my feet, but with a thick sock..they'll be just fine.