You will be required to buy, via payroll deduction, 1 blazer 1 tie 2 pair of pants. The “fitting” process was pretty basic, but what I’ve experienced more or less at a previous job. Walk into a room, they have a bunch of sizes of coats laid out. I think it was all even numbers, 38 40 42 44 etc, some Regular some Tall (or long, I forget). The pants, I think I remember they just measured with a tape for inseam and waist and wrote that down. No trying on pants. There was also a standard length tie and a long tie.

If you’re going to buy anything outside, I’d just stick the shirts. You’re going to have to get all the items anyway. And in the cooler months blazer is required (with a carve out for certain cities/domiciles where the winter is warm and a coat would be uncomfortable; I have yet to experience personally how liberal that discomfort rule is applied). I’d rather just have the pants match the jacket this time around, and the kind of charcoal-ish black-ish color is different enough from my favorite black slacks anyway, probably would stand out too much anyway.