what to wear to a christening

If you're willing to splash out and you're a bit self-conscious of your tummy, you could try some nice shapewear (http://www.debenhams.ie/webapp/wcs/stores/servlet/prod_10052_10001_158010310960_-1). Some places do stuff that's not just great for your figure but also actually quite sexy!

I've no idea what age/shape you are, but here's a few things:
http://www.nextdirect.com/ie/en/shopping/women/going-out/22/1?pid=778621&curr=eur&lang=en&country=ie&curr=EUR&returnurl=%2fsearch%3fp%3dQ%26lbc%3dnextdirect%26uid%3d15692777%26ts%3dcustom%26w%3d*%26af%3dgatt2%3a1%20cat%3a418%26isort%3dbst%26method%3dand%26view%3dgrid%26nxtv%3d000%26nxti%3d0%26lang%3den%26country%3die%26curr%3dEUR&bct=%26quot%3bAll%20Items%26quot%3b%26nbsp%3b%26gt%3b%26nbsp%3bWomen%26nbsp%3b%26gt%3b%26nbsp%3bDresses

http://www.awear.com/jolie-moi/jolie-moi-laced-leaf-dress/invt/00008035beige/

http://www.debenhams.ie/webapp/wcs/stores/servlet/prod_10052_10001_54510+201805690_-1

http://www.debenhams.ie/webapp/wcs/stores/servlet/prod_10052_10001_54510+201833000_-1

http://www.debenhams.ie/webapp/wcs/stores/servlet/prod_10052_10001_54510+201850146_-1

You can pretty much wear anything that isn't too short or too revealing. Treat yourself and get out of those jeans!