What does your baby sleep in?

ALF
My LO is 11 weeks old and I cannot find side snap shirts to pair with the sleeveless sleep sack in a big enough size anymore (can't find them past 6 month size which are getting snug on my little guy).  
Are you guys still putting your baby in sleep sacks or have you moved them to regular pajamas?  And if you still have them in a sleep sack any good places you find the side snap shirts for them?