Can you help finding a dress

I'm in my mid to late twenties and I need a New Wardrobe.

I need some formal dresses for events.

I actually need different dresses for like church, weddings, sweet sixteens, fancy parties, charity fundraisers etc.

I've always been into billabong & Roxy

I need a better look like sophisticated yet sexy

Getting down to thirty I need more formal looks and still sexy though not to sexy I need more professional clothing something fancy sexy what website's do you recommend & shops. Can post pictures of dresses & outfits for ideas.