Has anyone made the school days jacket with buttons or snaps? No toggle closure

Hi I’m thinking of making the school days jacket for my 2 1/2 year old granddaughter. I love the look of the toggle closure on the turquoise jacket. But I question how they will hold up. And where to even get those exact closures. I only have a Joann’s near me. Also I feel they would also need snaps to insure the coat stays closed. And that’s a lot of work to get a 2 1/2 year old into a jacket. So I’m thinking of just using buttons and or snaps without the tabs I’ve seen in some photos. Has anyone done that? Are there photos? Last question has to do with sizing. I’ve read some comments that this jacket runs large. And I’m wondering if I should size down since I want her to wear it now. I plan to make the jacket with a med/heavy weight flannel outer, Joann luxe fleece lining (med/heavy weight) and a Thinsulate or thin cotton batting underlining. Thanks for your help