Go for formal wear that will something covers your tummy, and covers you well - but you can wear some cool and bright color.

Dressing for a gala event is quite rather not so simple. Since it is typically a formal wear occasion. For men, that equates to a tuxedo or at the very least a  bowtie and cummerbund while for women, formal wear is typically a long gown with high heels, matching accessories and jewelry.