You probably look at bundling your products appropriately. As far as redesign , hope this info might be useful: Redesign steps
If they are abandoning their cart. These could the possible reasons. The shipping cost is too high or not a suitable shipping option for them. The payment option is not secure or not available to them. The shipping transit time is too long.
It will be great to see your site, however often people are distracted on a cart page by other special offers. Nothing should divert them from proceeding to payment, they have already made their choice.
Probably our review of eCommerce design trends will be useful for you http://www.itera-research.com/simple-tricks-to-increase-sales-on-apparel-ecommerce-websites/