This pattern can be made into either a romper or a dress. They can be made with a rainbow or any pick and mix square for the front and a plain granny square for the back. The directions to make the rainbow square are included in the pattern, the pick and mix square is also included in this pattern, but you would need to visit my website to see the instructions for the details of the square you choose. The links to my website are included in the PDF.

Materials
Main colour Dk / weight 3 yarn (For my example I used King Cole Cottonsoft in shade Azure 210 metres per 100g ball)
Small amounts of rainbow colours or your choice of pick and mix square.
3.5mm and 4mm crochet hooks
2 x 15-20mm buttons

Written in English US terms with abbreviations for UK

Gauge
With 4mm hook
9 dc x 4 rows = 2” x 2”

The PDF is 34 pages with plenty of photos.