Best place for a dress

Ri

We are renewing our vows and blessing our marriage in the catholic church at the same time my two sons are getting baptized. I want to feel pretty and sexy but also cover appropriately while being able to wrangle my kids and look good for pictures. This is extremely important to my family and everyone will be there. Help me find a dress please. I'm about 280 lbs and my belly is larger my chest is on the smaller side and larger hips on averagea size 22. Recommendations for websites, stores, colors, styles, patterns. All recommendations are welcomed.