Ugggg! I feel this! Jeans, OMG. I'm oddly shaped. I'm thin, but I'm curvy too, if that makes sense. I'm about a 23" waist, which is about a 00 size wise, BUT, I have hips and a round big ol' ass, which is probably around a size 4. Literally every single pair of jeans (well, any pants for that matter) fit my butt and then I have this huge bunch of extra material to deal with at the waist that even a belt doesn't always neatly address.
And dress pants are terrible too. Who is 7 feet tall with a 23 inch waist? Because these are the pants I find.
I don't shop online for clothes. I can't. I have to try things on.