Her clothes are disintegrated

The blast surrounded Clara in a golden light, and she felt herself becoming strangely weightless and transparent. As the light faded, she realized in horror that her clothes had completely vanished.

Frozen with shock, Clara instinctively tried to cover herself with her arms as she looked around in disbelief. A small crowd nearby noticed what had happened, reacting with surprise and astonishment. The Tardis then materialised in her position. Safe yet, embarrassed, but relieved to be out of sight, wondering how a nightmare had somehow become reality.