If the weather is warm enough, I don't think there's any real prohibition on wearing white. Certainly, it's perfectly acceptable when visiting the Caribbean in January.
I do have a somewhat humorous story about an acquaintance who spent a summer holiday in Vienna during the early 1970s. As was the NY fashion of the time, she did her sightseeing with a dress, white shoes and a white purse. She was disturbed to find that the men of Vienna were extremely forward in pushing their attentions upon her.
A sympathetic desk clerk at her hotel clued her in. At that period in Vienna, a white purse and white shoes was shorthand for a street-walker. You can bet she started wearing other color shoes very quickly and enjoyed the rest of her holiday in peace.