Dresses deserve pockets.
Somewhere right now, someone you love is holding her phone in one hand, her keys in the other, and a drink in a third hand she does not have.
You can fix this. Buy her something with pockets — real ones, deep enough for a phone, sewn open at the factory, put where a hand actually goes.
It costs no more than the version that lies to her, and it is a very small kindness with an unreasonable rate of return.
Notice anything missing?