I was bridesmaid at a wedding in October just gone. I was losing, losing, losing and pleased with my progress, but I knew I still had a long way to go to target. The bride had her heart set on high-street dresses luckily, which meant no problems with dressmakers, but when we went dress shopping I was still a 14. I knew that come the wedding I wanted to be a 12. So, we bought 2 frocks! She bought the 14 and I paid for the 12. I kept taking one back and re-purchasing it until I knew I could get into the smaller one...which I did. And on the day itself, it was actually a fraction big
The smaller dress really gave me something to aim for. Trying it on regularly gave me focus and despite the odd off week, I was determined to look as good as I could.
If you're having them made rather than off the peg it will be harder...and I only dropped one dress size not 4½ stone! You'll look soooo much different that much lighter. It's hard because you don't want to risk getting a smaller dress made up and then not fitting into it (not saying that you won't succeed, but it's something to bear in mind!!) so you'll have to get a size that fits you now.
Most dressmakers are used to people saying they want to lose weight and have ways of making sure that the dress will fit you. The bride could pay for the dresses now, but you could go in to have your measurements done much closer to the time, then the dress would be ordered to the size you are then...and if you lose more subsequently it could be taken in to fit.
Don't worry! You will look fantastic come the wedding day