I am knitting a 'baby cocoon' for someone and they want me to put in a couple of openings so they can have it on the baby when the baby is in the car seat. It's a simple pattern worked in a basketweave pattern. I have tried just casting off in the spot I would think the strap from the car seat would need to go through, and then casting on again in the next row. But I don't like how it looks. I hope I have made this understandable... does anyone have any suggestions on how to make this slit 'neater'? Any help or ideas would be appreciated. Its frustrating because I think this is probably a simple thing, but I haven't figured it out. Help!