With jeans may I suggest you ship them in the flat rate padded envelope. A size Zero should fit nicely in that package. and it can be done for around $5.15
you can check the shipping at usps.com my zipcode is 14624. They aren't too stretchy. They're not really broken it I got them about a week before I found out I was pregnant and could no longer fit them. They're rip tare and stain free!