Generally,In North America the bridesmaids but in the UK is seems the bride. Discuss a budget with them individually and find a dress in the smallest budget.
If the bride can afford to, it's a very thoughtful gesture for her to pay for the dress or a portion of the cost for each of her 'maids.
Traditionally,bridesmaids should be prepared to cover the costs for these expenses once they accept the offer. It's up to the bride to let everyone know about all the upcoming financial responsibilities from the get-go, and bridesmaids should be honest up front if they'll be under a monetary strain.
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