I graciously (see: did a little dance thinking of what I could buy) accepted their challenge.
Rifling through the colour coordinated and size-sorted donations, I spied this pale blue shirt dress with a huge full skirt. I thought it looked rather cute so popped it in my 'to try on' pile. I only noticed after falling in love with it, that it was vintage Cacharel- particularly desirable to me after I lusted after their recent print collab with Uniqlo. For £14.99, it was a done deal.
The accessories were harder- most charity shops are full of 90's studded belts and acrylic gloves. The white straw hat was a lucky charity shop buy for a fiver, decorated with a length of my own blue satin ribbon to match the dress. The pink shoes were a car boot purchase, originally from Primark, for £3 and the socks were new from Topshop for £4. The sequin bag was an old vintage find, so technically free.