Not trashy. Those girls look secure and photo-ready! What matters most though is if you are comfortable with it. If it is too much boob for you then perhaps your seamstress can add lace to give you some more coverage?
The only other issue I can see would be if you are having a church wedding and your church has modesty restrictions.
Definitely agree the most important concern is your personal comfort with it (and if the ceremony is at a church with rules as Grace mentioned). If you personally feel uncomfortable with it, maybe see if the seamstress can add more of that nude color paneling I see that your dress already has on it.
I do think the dress looks awesome on you! 😊 I’m a lover of floral details as well 😄
The dress is beautiful. The amount of cleavage is a personal preference. Some people feel that no one anywhere will or should be upset by what you are showing, and others feel that is way too much skin on display. If you are marrying in a house of worship and have very conservative guests, that is the group that will be uncomfortable with the cleavage. Regardless of the venue, I personally would not have that much skin on display in front of relatives but do what works for you. How do you feel in the dress?
Your body is your own, and contrary to misogynistic society, not subject to others' approval. I would not ask the opinion of others in this case because you're an adult. Go with what you are comfortable.
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This is contrary to your prior advice to not list a guest dress code because they are adults. Why can't we assume the Bride is an adult and can dress herself? She doesn't need permission at her own party.