Just ride in in your interview wear. It isnt a Managers job, they wont expect you to be in a suit. Wear some neutral/dark trousers, without rips on the knees, and if possible, a plain light coloured shirt, and shoes – dont go in with manky discoloured trainers.
Riding a bike in that outfit for 5 miles will be no problem. I used to do it all the time in the 80’s and 90’s. There’s no need to race there, make it last 20 or 30 minutes, and you wont even break a sweat.(I go at that pace when my OH comes out on the bike, it’s frustratingly slow for me at times, and I’m not particularly fit).
If there is a chance of rain, some light, thin overtrousers and a waterproof jacket will be fine.A backpack will help to keep the waterproofs in.
We’ve suddenly gone to needing full bike clothing when out on a bike, it isnt needed, and was never used before 1990.