Sunglass styles change every year, just like every other fashion, but the selections are so varied that no pair will ever really go "out" of style. And since sunglasses don't have to be expensive to be effective, you don't have to spend a fortune to develop a nice collection.
Designer and specialty sunglasses, like the kinds used for sports, cost more than most sunglasses, but you'll find all kinds of fashion glasses for sale at affordable prices. Watch the UV ratings carefully and you'll be fine.
Unless you already know which frame shapes look good on you, go shopping and try on as many styles as possible. If you can get permission to walk outside with glasses on, do it, so that you can find out how they actually work in the sunlight.
Here are some of my favorite brands
Ray-Ban
Features
Lens Material: Glass
Lens Color: Green
Lens Shape: Rectangle
UVA, UVB Protection
UVC protection
Polarized lens
Anti-reflective Coating
Frame Material: Plastic
Frame Color: Black
Frame Style: Full
Size: Large
Soft case
Women's style
Lens width: 61 Mm
Lens Color: Black
Lens Shape: Wrap
UVA, UVB Protection
UVC protection
Polarized lens
Mirrored lens
Frame Material: Plastic
Frame Color: Black
Frame Style: Full
Size: Large
Soft case
Unisex style
Lens Material: Polycarbonate
Lens Color: Grey
Lens Shape: Shield
UVA, UVB Protection
UVC protection
Frame Material: Plastic
Frame Color: Black
Frame Style: Full
Size: Large
Hard case
Unisex style
Temple length: 125 Mm