In today’s edition of pandemic boredom, I just scanned the Lucky Shopping Manual for the first time since probably 2004. Amazingly so many of the recommendations hold up. As you can imagine some examples look dated, but there are tips about fit and proportions that are useful. While other things about work clothes and minimizing features are products of its time. Anyway it is a good guide.
https://www.amazon.com/Lucky-Shopping-Manual-Building-Improving/dp/1592400361
I'm just like you, 5'5" and around 120. I bought this after taking it out of the library a few times. It's pretty good. Check it out at the bookstore.
Don't accidentally get the "guide to mastering any fashion" though. They look very similar.
https://www.amazon.com/Lucky-Shopping-Manual-Building-Improving/dp/1592400361
I don't really follow this book, but did read it and it seems helpful. I seem to do ok on style though, so I don't refer back to the book when shopping etc.