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Don't wait until a month before - you'll end up stressed and your options shrink fast, plus alterations take time. Start about 2 - 3 months out if it's a formal wedding where you need something tailored, or 6 - 8 weeks for something simpler you can grab off the rack. That window gives you breathing room to find something that actually fits and looks good without rushing, and you're not competing with everyone else scrambling at the last minute.
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