I just had a Lil boy and all I've been wearing is big shirts which makes me look and feel twice as big. I don't know what to do because I cant stand things that are tight you know.
I suggest that don't wear shirts. Try wearing blouses that are exact for your body. It would also show your figure. :) And I think sooner or later you'll return to your normal size.
I would go out and try on clothes and see if you like the way you look and since you don't like clothes that are tight, this is best to know before you buy. Don't buy so much clothes because you never know you might like dude123 said, go back to your normal size. It's best to be in the dressing room for a couple of hours so you'll know what type of clothes you're comfortable in. Next time you shop you wont have to go in the dressingroom so often.
Congratulations!