My MOTG capsule is geared toward dogs now, not kids But what works for function and lifting, or multiple errands, and getting people/animals in and out of the car are lean cuts that don't flap and catch on things or need adjusting. If I'm moving fast: stretchy pocket leggings or skinny stretchy jeans, a fitted top, jacket (with pockets that fasten to carry phone and wallet), closed toe walkable shoes, a small crossbody bag. Add a duffle bag of dog gear with shoulder strap -- it all works for a day trip or going cross country. Add a hat, sunglasses, and gloves for cold weather. It helps if everything is washable. Waterproof sneakers are my friend 9 months of the year.
If I'm meeting friends at a coffee shop, then stretchy cropped pants with zip pockets, no handbag, a nice cardigan or topper, a pair of sandals kept in the car for 'smart casual' wear.
For lunch with friends (dogs left at home) I can break out a dress and fashionable topper. I've had lunch out exactly 3 times in the last two months so I'm hardly an expert at this one!