Reddit mentions of Ralph Lauren Long Sleeve Classic Fit Mens Shirt, Windsor Navy, XL

If you like the jacket, I’d wear it like the model with a white t shirt underneath.

Try this in the wheat

U.S. Polo Assn. Men's Corduroy Sport Coat RAM1011J Wheat, 48 Long https://www.amazon.com/dp/B00M4LXMFS/ref=cm_sw_r_cp_api_9Dw7BbWVFZKB8

Some dark jeans, chukka boots or oxfords, and a t shirt or a button up like this

IZOD Men's Big and Tall Long Sleeve Oxford Plaid Shirt, Saltwater red, 2X-Large https://www.amazon.com/dp/B079PTJFV7/ref=cm_sw_r_cp_api_FFw7BbNG2N4NZ

Or solid colors like this
Ralph Lauren Long Sleeve Classic Fit Mens Shirt, Windsor Navy, XL https://www.amazon.com/dp/B0156XTKRO/ref=cm_sw_r_cp_api_cJw7BbFAEJRH4

Here’s some shoes that are reasonable

Clarks Men's Grandin Plain Oxford, Dark tan Leather, 9 M US https://www.amazon.com/dp/B078HYQZNL/ref=cm_sw_r_cp_api_vGw7BbJTZM323


And then you’ll have a fantastic business casual outfit and pieces you can build off of.