One day last Summer, I collected my lady from her work and we set off on the two hour drive to the house of one of our friends, who was hosting a party.
Less out of necessity than out of a wicked desire to tease me, she decided she simply had to change out of her formal work attire into her party gear whilst we were driving. The fact that the motorway wasn't too busy at the time helped also.
Anyway, I'm sure you won't say no to a pic she snapped on her phone whilst in the middle of changing. Apparently the 'work' bra didn't work with the party top.