Thank you all for the very helpful suggestions.
Just got back from a walk with the doggies, tracked my walk on my phone using 'iMapMyRun', very clever app. I managed 3.06km in 27:21 mins. Calories burned using average use assumed = 150.

Any chance they will change it for you. We were able to do this when my DD was married and one of her bridemaids lost a dress size. She was walking to and from work and drinking alot of water.
Rivlas, no chance to take it back unfortunately. Gosh, I wish that was my problem.

have you tried it with some shapewear underneath?
Googled and going to Myers/DJs ASAP.

Where doesn't it fit you exactly? Around the bust, waist?

If I were you I would go and find a good corset, a cincher if it is the midsection that is the problem. You will need to find a real corsetier, not like one from bras and things or something, but a proper corset, steel boned, but it will easily take you in enough to wear the dress for the day without the unhealthy aspects f having to lose weight - which you may not lose from the place that is preventing the dress from fitting.
LS, its the bust/wasit area, the rest of the dress is flowing. Shall, google corsets. Thanks for noting not BnT, I would have gone there tomorrow :blush:

I ended up getting mine altered as no way was it going to do up around my lactating boobies!

Take it in to an alterer for a quote, I think I paid around 80 dollars and they took material from the hem and sewed some new panels under the arms so no one could see
Thanks appletree, this might have to be Option2 in week 2. Fingers crossed.

5kgs can be done - ditch the shake diet though.

Exercise (one hour each and every day) and limit your calorie intake (websites like calorie king will give you an intake if you enter in some information).

Honestly it is a hard slog, and I've done it myself - and was stoked I did it on my own.

Alternatively you could get some shape wear? It'll take a dress size off of your body .
Thanks Leesa, I'll be sure to add some Kms to FCS
I'll be sure to do 7 days of exercise. Walking, light weights etc...
I said to DP Leesa said to.... and he said Good! You can take the dogs for a walk of a morning before work

I was going to say similar to Leesa with the exercise.

Whenever I have had really good weight loss weeks, it has been because of exercise. Also exercise will help tone you up which will take of the centimetres which is what you want. The shapewear will also help take off cm.

Give yourself 2 weeks and if it looks like its not going to fit then take it to a dressmaker to be let out. Make sure you try it on at the end of each week with the shapewear on to see how you are progressing.

Good luck hun.
Thanks AliB...

I'll keep everyone up to date with my progress. Silly me for leaving it to the last minute despite my organisation and planning earlier (20 weeks ago)