We got Milli's jammies online at Drs. Foster and Smith. As of 7-26-10 they still have some XS/S and some M/L in stock and they're on sale for $7.19/$11.79 respectively. At 6 lbs. Milli wears the size 'XS/S'.
Dog pajamas: My Favorite Jammies |DrsFosterSmith.com