This is a true challenge!
I am 5'3", size 18-20, very much an apple with broad shoulders and vast acres of belly, and chronically scruffy. Yep, I'm hawt 
Anyway, I have a business meeting in a couple of weeks which is being pitched to me as a no-obligation opportunity to go into some details about a prospective venture. However, due to the circumstances and the nature of the job, it is effectively an interview. So I can't rock up in torn jeans and a hoodie.
I will also be sitting on a train for a LONG time beforehand.
I was thinking perhaps a dress and jacket might be better than trousers and a shirt from a non-crumpling perspective.
I also have a tiny budget. Tiny tiny tiny. Unlike me.
Any thoughts?