Oh I've had a few of those.
My mate wanted me to make a christening gown for her son from her taffata wedding dress, no mean feat as I had no pattern and they lived in Lythams St Anns and I lived in Hertfordshire at the time. Measurements were done over the phone and the design was to, She wanted the full gown with lace odd for a boy but Her mother in Law was a stict catholic and wanted it all very formal, so I made a basic over long t shirt shape gathered in the sleeves and added some gold embriodery and I'm proud to say it met her MIL's approval. I have also been lumbered with costumes to make when daughter was a school all with just rough measurements and also no patterns and then having to take out and add bits where they had got them completly wrong