Sometimes it is not the cross body but what we put in it.

My Nylon Bagellini; has a small pack tissues, chap-stick, eyeglasses, pen. Lidoderm patch and one day pills. The tiniest brush in the world.

I carry my cell phone in my bra...yuck, but if with dh that is all I need.
I have a wristlet ID, cards, cell and cash.
Usually I can keep it in the waist carrier, but the wristlet protects the magnetic strip in my card, and holds the cell snug. Love my hands free blue tooth too,

If alone, I have the wristlet and it fits the cell phone in the back. It was a treat from Vera Bradley, on clearance and $5 shipping or free with the order can't remember.

Now in the car is my real bag, with one of those Kangaroo carrier so I can switch from one to another.

The closest thing to high heels I have are Croc's
I actually have one pair that have a strap sandals with heel. Not too high and are for not really walking. Croc's Mary Jane for the summer, and Croc's band with limited fleece for winter.

sneakers I have Sketchers that are like Mary Jane's, one dressy pair and one neutral with airy weave top area. Then a functional RYKA that have a lot of room and no pinching. I put in gel inserts for cushion.