Maternity Dress - HOPE & IVY - Size US 6 / UK 10

Hope & Ivy Maternity open back dress with ruffle hem in poppy floral. Purchased from Asos for a wedding and does not fit. Beautiful dress but too tight across chest and bump! I ordered another dress in size US 8 that fit perfectly. I have included their maternity sizing in the photos for reference. I would say fits true to size and that I just ordered too small hoping it would fit! Please let me know if you would like any other measurements or details! Never worn - NWT!