Fitting and suit pants

I am looking to get into more formal wear and I want to start by getting into more trouser styles. I have a very large behind and thighs as well, this makes majority of the slim fitting suit pants impossible to fit. So what fit would you recommend for off the shelf purchases? Along with this question, would you guys recommend slightly tapering the pants if it’s too wide even if it has pleats? I bought a pair of trousers online that are too long and wide, cutting them down to length won’t be a problem but I fear tapering them might look weird. I could also send a photo of the pants if anyone needs? Thank you guys so much!!