Its probably best to have a 50/50 mix of gumpaste to fondant for your sari, so it will still have flexibilty but then dry hard and it should not crack.
It will be fine transporting it, just give yourself enough time to have a steady drive to the venue.
If you were to make the Sari and then try to attatch it at the venue, it will probably break because it would have hardened and like you said may not stay attatched.
Make sure everthing is made, dried in advanced after being glued with royal icing and you’ll be fine.
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