Nicole, I think you've got some great tips!
As a SAHM for about 5 years now, my outfits have evolved with the age and stage of my daughter. I wore lots of button-down shirts while breast-feeding, and did not wear necklaces nor dangly earrings until my daughter was a toddler.
Now, that I am a SAHM of a preschool age child, I have a couple of uniforms depending on what I am going to be doing during the day, and what the weather is going to be like.
I usually wear a pair of dark wash jeans, some fashion sneakers, and a longer length tea under a cardigan or casual jacket. I make a point of not spending too much on any one item so I don't freak out when paint, boogers, puke, or poop eventually lands on them. If I have meetings while my daughter is in school, and I want to look a bit sharper, I'll wear boots over skinny jeans, and a knee length overcoat.
I've also found that a handbag that can hold a change of clothes, snacks, purel, kleenex, and a big wallet to be invaluable. For a few years I carried a backpack thinking this to be most practical. However, when checking out at grocery stores, there are lots of contortions you'll have to do to get the thing off your back, unzip the various compartments to get to your wallet, and put it all back. An open bag that fits nicely next to my ribs seems to be the best bet.
A final must-have item in the Pacific Northwest is a raincoat with a hood. It is impossible to juggle holding hands, opening car doors, and an umbrella. Having a raincoat with a hood this year has been a nice convenience for me.
Are there any SAHMs out there that wear outfits that match their kids? Just curious.