I have, even when skinny (which I'm currently not), unusually large hips--about 14" larger than my waist (most women's clothing is made for hips 8-10" larger than waist). As a result, i have an awful time with any clothing, unless I sew it myself (not something I've ever wanted to do, except for 1860s reproduction clothng). I have to get XL jackets if I want them to fit the top of my hips instead of bunching at the waist. At least I can layer lots of stuff underneath!

As Aimless says, most of us do not have bodies that fit the supposed "models" that clothing companies use. It doesn't help that, despite so-called standard measurements, each model is different. If you want perfectly fitting clothing, either learn to sew or hire a seamstress/tailor. Or put up with the "blousiness."

It does help a little to shop around and try many different brands. Some fit better than others.