the Build a Bear outfits are too big for the most part. I have the HUGS sweatshirt for my PM1 and although it's large on him it looks cute

I have a t-shirt from there that is one of the University shirts a friend brought back for our group's Pals and again it's large but he wears it with his sweatpants *grin* I have the Elmo t-shirt which I think is cute on him and goes with his jeans or a PJ shirt.
Build a Bear has baseball hats that fit alright, not perfect but they work. I have the red and I seem to recall them having a blue one of course they currently have the baseball hats for your local team in stock hopefully, or online.
If you have a Joann Fabrics Etc store in your area they have jeans (boxer or shorts for their bears) that fit the PMs as jeans.
The camp outfit at Target by Build a Bear might be on sale it was a week or so ago here and it fits. A bit snug in the shorts so I would suggest the parent put them on.
http://www.geocities.com/raymedi/PalMickey/greysweats_2.jpg
Mick is wearing the Utah t-shirt from Build a Bear with the grey zipper jacket from Michaels. The pants are Joann Fabrics Etc.
Basically Mick has a ton of clothes and it comes from us finding plush that is about his size or I found a local store that sells t-shirts I can iron onto. He has the build a bear Dalmation slippers which I recommend if you use them to get little baby socks for him to wear to keep the red from rubbing on his poor yellow feet.
There is a Fan Club for Pal Mickey where we share ideas and just celebrate PM
The sunglasses fit him pretty good as well just not sure if you want the kiddos with them in the park in case they come off and get lost. Mick wears his in the park but then again I'm a kid at heart and watch over him like a mother hen.
Let me know if you have seen something at Build a Bear and wonder if it fits, Mick pays a visit to our local store quite often and will be going back soon. So it's possible me or friends have tried it on or had ours there to compare or I can compare it when I go the next time.