Crop image function during customer file upload (Wordpress) woocommerce - woothemes

I have an ecommerce site for personalizing a variety of products. I already have an upload image feature on my website. I just want customers to have the ability to crop to size that will fit to scale or aspect ratio to the selected item. Im not sure what is needed to accomplish this task. I am open to suggestions and options. Please help and advise. Thank you in advance! My website is using (wordpress platform) - Theme/Template from Woothemes - Ecommerce shopping cart function from Woocommerce....