For pete's sake...it's in the basement of a house! Watch out for the pipes overhead and the walk through the prep area if you have to use the washroom. IMHO, this place is highly over rated and over priced.
Something with an elastic waist :). I kid (somewhat). My experience has been that the attire at Chef Vola's runs the gamut from dressed to the nines to jeans. I usually go with dressy casual, but that's just me.