Hi, welcome to the fraternity.

For new hires (UT/BT) joining a school, normal advice is to dress professionally and conservatively. Plain shoes or sneakers should be fine. Observe the school culture and your colleagues for a couple weeks, then adapt accordingly. If in doubt, you can also ask your SSD, RO, or mentors.

Some schools allow for dress-down (on certain days) due to the hot weather for staff. But this is down to individual school practice, so only the staff in your posted school can advise you.