If I had to add to the list of companies to get thongs from I would say give JM thongs a go from Canada, they are my go to regular wear thongs for everyday wearing, they give you that feeling of not wearing anything.
On the subject of string or g-string style thongs I would highly recommend Barcode Berlin ones, German company but products ship from Portugal but ship round Europe very quickly, I did think that they were gone be uncomfortable as I'm not a fan of g-string's or string thongs but their Miran style string thongs are SUPER COMFORTABLE, highly recommended.