I would go with the dressiest style their suggested range allows, even if it's not as dressy as you think you should be. (I'm not good with clothes, so sorry I can't be more specific.) Sometimes people say you can't "over dress" for an interview, but that's not really true; if you came in wearing a very formal suit, you would probably stand out in a bad way. I don't think it would be as bad as showing up in your pajamas (under dressed) and I don't think it would be a HUGE bad thing, but every little bit counts, you know?
Maybe a nice top and slacks, and bring a jacket that you COULD wear, but wait until you get there and look at how others are dressed--more flexibility.
I'm a Vet Tech, we deal with animals and bodily fluids all day every day. We frequently wear them. We expect people coming in for an interview to have on mid-range decent slacks (Dockers, chinos of some kind, NOT a fine wool gabardine!) Nice shirt or blouse, but NOT fancy. I've seen people come in for interviews dressed in skirts suits or pant suits suitable for greeting the public in a high end bank. It's not well received, because it's not appropriate garb for that venue. People who over dress in our world are thought to be too prissy and unwilling to 'get dirrrty', because our experience is that, even after they put on scrubs, they don't handle the body fluids well, and in our field, it's inevitable that we will be wearing them at some point.
IMO, if somebody with knowledge of a field and a specific company culture tells 'you' to wear X style clothing, you should do that. You don't want to be a clone, but you do want to look like you belong and can blend in with the existing corporate/company culture.
Yes, I was just thinking about this, because I work in a place where our part-time college-student interns could get dirty doing normal chores--soil, dust, plant material, etc.. For the actual employees I always tell them it's a jeans-and-t-shirt place, and I don't want to hear them say, "I don't want to do that chore today, because I don't want to get my clothes dirty."
We don't put anything about dress code in the job advertisements, and most people wear jeans and a t-shirt to the interview or maybe a bit nicer, like a button-down and khakis. Every once in a while we have someone show up in a suit and it's kind of like...
In the first place they're dressed about three levels higher than the rest of us, which is kind of weird. Second, you start to get the feeling that they're a bit desperate for this job, that they're pulling out all the stops, which isn't attractive (also depends on body language etc. too, of course). Third, you suspect they don't have a good sense of the kind of duties the job entails and you wonder if they'll have a problem with doing some of the dirty parts.
If someone walked in the door for an interview wearing a suit, I wouldn't tell them to turn back around, you're an automatic NO. There's a lot of other things that go into the decision, and I'd rather they wear a suit than their pajamas or a t-shirt with an obscene saying on it or something like that. But it's noticeable, and not in a good way. I would think it would be even more noticeable, and in an even less-good way, if the company actually told
you what to wear, and you ignored it. So, good job, OP!