Applied at Victaulic for Unknown

I have an interview scheduled for next Wednesday at Victaulic, where they manufacture mechanical pipe joining systems. I'm trying to figure out the best outfit to wear. Should I go with work pants, jeans, or something else? I'm considering a plain black shirt or maybe a flannel, but I want to strike the right balance between not overdressing and not underdressing. Any advice on what would be appropriate for this kind of setting would be greatly appreciated!