J.J.
My number 1 "crafty mom" rule? Stick to pre-made items as your base - it saves a ton of time, and insures that your little one will have a properly fitting outfit. So, that being said, ask her what color pony she wants to be. I think the pony you are referring to is gray. So, go out and get her a plain gray jogging suit (the top needs a hood). You'll need yarn for whatever color she wants her mane, and if you're low on glue sticks - stock up now! :) There is some fabulous multicolored yarn that would be great for this project. Get some fabric for the underside of the pony (pink maybe?). You'll want to cut that in a large oval like shape and then cut it in two pieces - the top to be glued on her shirt, the bottom piece for her pants. It should be arranged so that when she puts on the suit her "belly" will line up. Next you'll need some felt or foam sheets for her ears. Both of these materials will cut easily and stand upright when on her head. You need to cut lots and lots of pieces of yarn for her mane and they will be glued, one at a time, :) to the top and back of her hood. Just keep gluing until you have a full mane. You'll need to cut two ears by cutting triangular shapes from the foam or felt (whichever you went with) and glue those on either side of the mane. You might want to invest in some face paint too, if your daughter wants it. Now, the only thing left is the hooves. I would use foam sheets and elastic for the feet hooves, by cutting a long rectangular shape from the sheet and punching holes (with a hole punch or it will tear) and then tying elastic string through. This is to wrap around her shoe, you can try drawing some detail with a paint marker, if you like. Also, try to have her in gray shoes, or put one of Dad's old gray socks over her shoes before the hooves step - if you take this route be careful. The sock will cover the shoes' grips (and probably be ruined by the end of the night). For the hand hooves, do something similar with gray gloves. Obviously the hooves for the hands will be smaller. Oh, I almost forget the tail. :) Use the same yarn as you used for the mane and glue some to the end of a piece of craft rope (that can be painted gray) or rolled up gray fabric. You can stitch or sew the tail to her pants. I think that covers it. :) Now why didn't I make my daughter a pony? ;) Oh yes... If all else fails, add some glitter and she'll love it. There are some great glitter fabric sprays in the craft section. :)