You should almost certainly go to a tailor. It makes a world of difference if "professional" is your goal. It can be tricky to find a good one, but when you do, it's incredible. It can be surprisingly cheap too (although building a wardrobe that has high quality piece that are worth tailoring can be quite expensive. This is best done gradually)
I think that this is especially true if you're on the larger side, because a greater amount of body mass means that qualitative differences in where we store that mass will be more apparent.
Something I liked about going to a tailor is I could show them clothes that I liked versus ones I didn't (or explain what had been bothering me about certain clothes). They were able to suggest alternatives.
There's already decent scholarship in this area. One such book is the recent "The AI Con: How to Fight Big Tech’s Hype and Create the Future We Want", by Emily Bender and Alex Hanna. I haven't read it yet, but I've heard good things about it and it's high on my reading list.