Dress fits but is tight, and i can't get into it on my own.

I would just wait for your fitting and see what the seamstress suggests. Keep eating healthy, exercising, and drinking plenty of water up until your appointment and then bring the bustier with you to that appointment. They can help you into the dress and then suggest what your best option would be for undergarments. I think drinking a lot of water is super important. I had my second fitting a month ago and my dress felt tight at that appointment because I was bloated from not drinking a lot of water and it just did not feel good. It still fit but it felt tighter than my previous appointment and I didn't feel as comfortable or confident. I've since made it a priority to drink a lot more water with lemon in it every day and it has really helped. I have my final fitting today and noticed I feel so much better this time around. My stomach is really flat from not being bloated (I've also tried to cut out/limit carbs and dairy) and my skin has also looked really good.

I agree with PP. Try to relax and wait for your upcoming appointment - in the meantime make an effort to curb the stress eating and eat healthy/drink a lot of water. That combined with some exercising, even just going on a lot of walks or being more active may help you kick just a couple pounds to help it feel looser! But your seamstress will be able to tell you the best undergarments or what you can and can't do. Definitely limiting the undergarments will give you more room in your dress because its less layers - but if you won't be comfortable without it then that doesn't work either!

I had a similar issue. My dress was uncomfortable to sit in for too long and I had higher shapeware. Took off the shapeware and it felt much better. It was just the boning that I wasn't used to and made sitting less comfortable. But I didn't do too much of that anyway!

I agree with pp. Eat healthy: no junk food or deep fried food, any added sugar, soda & super elaborate drinks loaded with empty calories, like Starbucks etc. Eat ton of veggies, complex carbs (whole grain bread, brown rice, quinoa etc), lean protein (chicken, turkey, lean beef), fruit & lots of water. Add any type of exercise, even just brisk walking, light jogging, yoga (which will help with toning), swimming, or anything else you enjoy.

For trying the dress, since you have nobody to help you put it on, you can just measure areas where the dress is tight (bust, tummy, for ex) & then measure them as you make progress to see if you lost any inches.

Your seamstress will take care of any necessary alterations. I wouldn’t go without some type of bra if you’re 42D & if the dress doesn’t have some serious built in structure.

I had a freak out when I tried to out my dress on before my first fitting too and it didn't fit! My seamstress said to me... Wedding dresses are not meant to be put on by yourself. If your dress is a little too tight, your seamstress will probably be able to let it out a bit. You'll be fine!

David's bridal charges $20 for cups to be sewn in so I can't imagine a seamstress charging more than that...in terms of other areas do what others suggest and good luck

I had this problem, losing weight and trying on the dress at home with nobody but FH. FH helped me try on my dress, he literally tied a pair of pajama pants over his eyes like a blindfold, and zipped me up. Haha it was funny and weird but it worked!

Try keto. Seriously. I've lost 25 lbs very easily in 4 months and I was already kind of on the small side to start with. Also, just walking 2 miles an evening and lifting light weights can help you burn fat. I watched youtube videos with Dr. Ken Berry to start and joined an FB group called Keto for Beginners.

I dont think ditching the bustier is the answer, because I'm guessing it also helps shape as well?
You got this. It still zips. And you've got a few months. SUMMER months. The easiest of all the months to loose weight.

Thanks, guys. I cut out all beverages immediately and have only had water today. I've also started a calorie counter, and I plan to utilize the community swimming pool as long as Florida doesn't decide to randomly rain on me. I'll see what the seamstress says, and try not to stress.