I see people rummaging through their purse/bag/backpack in search of keys/money/id/lipstick/phone all the time. I have long ago switched to using pants with enough pockets to keep at least the basics on me: keys, wallet, cell phone, a dedicated pocket for each, so I know where every item is and can feel the weight change/imbalance if something is missing. I have learned to always put each item back in its own pocket after use. This is harder for ladies but not impossible: a couple of keys, a cell phone and a tiny wallet with just enough room for an id, a credit/debit card and a few bills can fit, for example, in almost any jeans' pockets without visible bulging. The rest can go in the purse or backpack. Does not work for formal wear, of course, but there are usually plenty of suitable casual choices.