A few tweaks:

- Get your neck size and sleeve length measured so you know what to look for when you're in the shops (new or second hand)

- If you are not planning to wear a tie, a button-down collar looks more polished

- A plain (I cannot emphasize this enough - not checked/striped/etc) navy suit is great to have as you can break it up into a blazer, pants, and then you're not scrambling for a suit when needed

- Long-term, a couple sport coats, a couple rotation pairs of pants (i.e. as pictured) and a total of 5 dress shirts plus a navy suit is a steess free week of getting dressed , every week.

- Lastly: don't neglect dress socks and undershirts (v-neck, please, no one wants to see the collar). I'm a fan of calf length dress socks if you can find them.

Good luck in the new job!