This isn't about booties but one of the things I always tucked into gifts given to new Mammas is a baby hot water bottle. You can find these in most all large drug stores. Very soothing to tuck against little backs and tummies. I make a few nice terry cloth covers for them out of a thick bath towel. I've always gotten very positive feed back after the baby has arrived that they are so handy to have around.
My son, who is now almost 40, still has his. He uses it on the side of his neck when things start to kink after a long commute home. He actually slept with it until he was about eight years old. It became a ritual to fill 'er up with warm water, drop it in the terry bag and snuggle it to sleep...that with Fuff the Wonder Dog......Fuff became so ratty it looked more like something you'd cleaned out of the shower drain......he still has that too, Fuff has a place of honor on the shelf with his cross country track trophies.
Just a thought, Val