Pear Shaped body types are proportionally larger around the hips and butt than they are anywhere else.
I have linked to posts that already have information on the topics. Otherwise, I have given you a bit to go on.
You need to find shirts that have a boat neck, flowing sleeves or anything that is going to pull attention up to your bust.
Patterns and stripes are great for balancing out a pear shape. Make sure you get a blouse that can be tucked in.
Skirts and Mini Skirts:
Any skirts that hug your legs are bad. It will make your butt look bigger. You want a skirt that falls straight from your hips or has a slight flare to it.