Rewrite the following sentence so that it does not contain the word "expensive":
"Sunglasses can be an expensive accessory"
Sunglasses can be a costly accessory.
Complete the following task based on the instruction and optional input provided.### Instruction:
Rewrite the following sentence so that it does not contain the word "expensive":
"Sunglasses can be an expensive accessory"

### Output:
Sunglasses can be a costly accessory.