If you've ever stood in a fitting room with your daughter, holding something up and quietly wondering whether it was right for her age — that's exactly where this started.
Between 8 and 14, girls grow at completely different rates, and the number on a label stops being much of a guide. It's the question I'm asked most often at markets — and there, at least, we can hold something up together and work it out. Online you don't have that. So I put together a few short questions to do the same job. It takes about a minute, and if we still don't get it right, returns are free for 30 days.