[raspberry] at your mum; I am really NOT impressed with her.
FWIW, I am a broadshouldered, big-boobed size 16 14, got married aged 31 in a fabulous preloved dress by a big name designer (the name of which I cannot even remember anymore...). I was dreading the whole being-looked-at all day, having photos taken, being the centre of attention. And yy to slimmer, younger, prettier bridesmaids.
I went dress-shopping with my size 8-10 mum who had to try on a number of dresses for me as all the sample sizes were far to small for me. Not ONCE did she make me feel awkward.
I had a brilliant day; I loved my dress, I was v happy about marrying DH and we had a fab day with our family and friends.
This was 16 years ago, the photos are a great memory and I look good in them.
My top-tip: go dress-shopping with someone who will be supportive, even when honest., Yes halternecks are probably not a great idea, but concentrate on what you DO like about your body, rather than what you don't and accentuate that. Do you have waist? Boobs? I bet you have legs to your armpits
. Find something you like about yourself and then make a dress show off that feature.
I totally agree that the wedding day has very little to do with how the marriage will work. Don't give in more importance than it deserves: it is a public marker of you and your fiance's committment to spend the rest of your lives together, no more and no less. A big celebration.
Like I said, our day was great, but not the best and not the most important day of my life. I get really cross with the hysterics over wedding days
Avoid shopping with your mum if she makes you feel crap. I'd even consider a personal shopper...