Suit and tie is nice in the real world. I think laboratory work is a little different from other places. When I first interviewed for a lab job in a suit and tie, the investigators who hired me asked me, "Where's your black suit?" for the entire first month on the job. To them, it was hilarious that someone would show up for a tech job all dressed up. In the years I worked in academic research, I never saw a post-doc interviewee or a research tech interviewee dressed up in anything more than a button down shirt. Most of them wore casual wear - clothes they'd wear if they were working in the lab. T-shirts, untucked polos, jeans, etc. Dress code never seems to an issue in day-to-day lab work.