In my opinion? Show it off, but in a subtle way. Full-on body con will make you look like you're about to perform gymnastics, which is not a bad thing, just not what you want to do on the night. Think off-duty superhero, more Diana Prince than Wonder Woman.
You could go the minimalist route and let your pecs do the talking. Here's a picture (by Robert Mapplethorpe) of body builder Lisa Lyon in a Greek style gown. For a more contemporary look, you could try a full skirt and crop top combination which will show off the abs. Either way, you will not look masculine. You will look amazing.
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