These cute overalls are crochet with two panels (front and back) then sewn together. Pattern includes bunny applique.

Written in US terms with abbreviations for UK terms.
Materials
2mm, 2.5mm, 3, 3.5mm and 4mm hook
2 x 15mm buttons
100g dk / light worsted / 8ply yarn for sizes n/b and 0-3 months
120g dk / light worsted / 8ply yarn for size 3-6 months
160g dk / light worsted / 8ply yarn for size 6-12 months

Small amount of beige, cream, blue or pink and black yarn for Bunny.

Gauge Square

With 4mm hook

Row1 Ch10, hdc in 3rd ch from hook and each chain across. (8) Turn
Row2-4 ch1, hdc in base of ch1, hdc 7. (8) Turn

Square should measure just over 4.5cm.
If you’re out with a 4mm hook try 4.5mm hook.
If you have problems hitting the length but the width is ok, try dc (treble crochet) instead of hdc.

Pdf is 18 pages.