Second interview, and "facility" tour.
For those on this forum, we don't know what the "facility" is; I assume you do.
With specifics lacking, I would suspect that a "tour" of the facility would not involve actually getting "your hands dirty". I toured a facility in PA about two years ago, not as a candidate, but as part of trying to develop joint business. Two of us (both males) were given a guided tour, a chance to see, a chance to ask questions, and also a chance to see what we had to offer. Anything "special" such as safety googles, and a hard hat in one area, were available and provided. I suspect this will be true in your case, but you know better than us.
That said, I wouldn't wear the identical outfit/suit, some of us male-chauvinsts actually do remember what one wears, and you don't want to possibly give a negative impression.
Unless you expect a lot of ladders or stairs (as on a ship, for example), I would stay with a skirt type outfit, but I would also avoid tall heels (I recall a "dependent's cruise" on my ship many years ago, where my wife and I were both amused by the number of women in short skirts and high heels - they had troube that day).