Sleep sacs are the safest way to dress a baby at night when it is time for bed. They help reduce the chance of SIDS drastically when correctly worn, and they still manage to keep the baby warm.
If you would buy this in the store, you will probably pay way too much for it.
Which is why you might want to check out this great tutorial that makes it simple for you to create your own sleep sac. All you need to do is pick a yard of fabric and then grab your sewing machine because the pattern makes it simple to churn out several great sacs.