AWESOME! Just FYI that Piper is 10 weeks and fits into the XS very well. She weighs about 3 lbs though, so I'm not sure how small your two are. I've bought a bunch of smalls thinking she'll grow into them. I hope she does because I'm thinking she'll end up 5 or 6 pounds. If not, I'll have some to sell!
I'm sure she can tailor them to your measurements. You'll love them.