According to a lebanese restaurant owner who also opened a souq for BD said to me that BD-equipment incl. costumes are imported to Lebanon from Egypt. A few time later I went to Lebanon by myself. My turkish friend living in Germany asked me for some BD-stuff. No chance. My leb. boy-friend even asked a dance-instructor. Mafi. The Tourist-souq was the only site where I saw BD-stuff (from Egypt) at a much much higher rate than in Germany. And not even a sufficient choice.
High-rated dancers like Amani have their bedlah's done by their own tailors. I guess the bedlah's are designed to please the individual dancer and/or their paying customers. I don't think there is a specific lebenese style of bedlah's.