A shirt belt?

"Oh crap!" Megan curses once more as she realises her jeans will no longer stay up on their own.

You feed a little inspiration into her mind and she shrugs off her check shirt, still not under-dressed with a T-shirt on and begins to fix the shirt through a couple of the belt loops on her jeans.

The shirt finally in place she pulls the jeans up once more and uses the shirt sleeves to tie them on before glancing at the clock. There should still be enough time to nip back home for a new pair.

She turns back to the middle of the shop where she left her shoes and you ponder how best to intervene.