You will need:
-A thinner lightweight jersey sweatshirt (interlock is perfect!)
-25'' of twill tape for the tie... I used some that came packaged around some throw blankets. I'm all about finding your sewing materials in the oddest of places!
-your sewing supplies, particularly some ball point needles
-This 3T pattern CAUTION: My pattern is kind of messy, that's just how I sew, drawing right onto some freezer paper! If you need another size, you will have to draft your own using some pants your child currently fits in. You can easily adapt this to a 2T by cutting around the main front/back pattern pieces 1/2''. The pockets and the bias binding should adapt to any size.
-possibly some contrasting fabric for the bias binding, the red pair have a denim bias binding, the blue pair have the same sweatshirt type material
-possibly some stabilizer for when you hem to keep it from going wonky if you don't have a serger (I don't either!), or you can try Jessica's method with tissue paper!
Other notes: I decided that this type of a sweatshirt WOULD FRAY, so you will need to finish (serge or zig zag) the edges how you see fit prior to sewing the pieces together. This tutorial assumes that you have SOME sewing knowledge, like I'm not going to go over how to make bias tape or hem some pants, for instance. There are plenty of tutorials out there on that already! I Hope you enjoy!