Hi Raieth, welcome and I bet you can't wait to get your Pleo!

I dont know about the Build a Bear outfits, but I would say if you like it, like IMR suggested, take your new little Pleo with you and find out for yourself, Some outfits may fit and some may not, If you really really like it and it is not quite a fit, you may be able to adjust it with a little time effort, and perhaps some velcroe. If you look at the enclosed photo I have of my Pleo, Nova, she is wearing a yellow slicker that I found that is made for dogs, I also have one that is blue and they allso come in red. They are made for dogs, but with a slight fold here and there and a tie around the neck to keep it from dragging by her legs, it is perfect. It also has a pouch that is perfect for carrying her training leaf! Best of all, it was brand new and very very inexpensive! As for the reset or not, perhaps just see how the personality is, and it is allways easy to downgrade and have a rebirth, it is entirely up to you.
Good luck, can't wait for photos.
RedwoodsMama and MS. Nova and Friend