New Zealand Law
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That can be tricky where you copy something designed by someone else. Under the Copyright Act you can copy for reasonable use, and where the dress is original artistic work, then you need to be careful. To help you understand this, artistic work is defined-
(i)a graphic work, photograph, sculpture, collage, or model, irrespective of artistic quality; or
(ii)a work of architecture, being a building or a model for a building; or
(iii)a work of artistic craftsmanship, not falling within subparagraph (i) or subparagraph (ii); but
(b)does not include a layout design or an integrated circuit within the meaning of section 2 of the Layout Designs Act 1994"
The issue of whether the original is a work of artistic craftsmanship can be difficult to define precisely. Some designers of course use standard designs that have been around for a long time and are not more than variations on standards. Others may be very original and unique. Tracking ownership can be difficult as well. Since you will generally be making only one copy, this should be fairly safe however. If a bride made her own dress using an original as the pattern, she could get away with this, but a commercial dressmaker would need to be more careful. The risks are however not great, and even if the copyright owner complained you had copied, then the damages would be small in any event, although obviously you want to avoid that possibility. So I suggest make some effort to see if the design is artistic craftsmanship or just generic. Proof of the effort should help in most cases.
With those changes you suggest, you should be safe. If the dress was an exact copy, there could be a problem, but if you are just "inspired by" that is legitimate.
I would prefer to say it is quite unlikely you will have a problem. I would not go so far as to say it is absolutely safe, but that may be a lawyers caution.
What you are doing is definitely not criminal in nature but a small chance of civil liability for breach of copyright which is about damages rather than criminal liability. I am the only NZ expert on this site however and you can choose to not accept my answer and consult with your lawyer. They will charge their usual fees of course