Yeah I came here looking for this. Old Navy size 16 "curvy" jeggings =/= size 16 formal dress. That's something you'd have to have custom made & TBH might have cost that poor bride more than her own gown.  I wouldn't expect Martha Dumptruck OP to understand formals because on the off chance some pigfuckers took her to a prom, her tarp probably came from Sears.