CruiseLineFormal.com does rent tuxes for $85 for a Black or White tux. $120 for the Black and White tux. For $15 or $20 you can add a different tie and vest.
Unfortunatly for the ladies on DCL they do not offer formal wear. This company does offer it on Celebrity, Holland America and Princess Cruises. They offer 3 different blouses and a couple of different skirts.
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