My last order from Abbarchi was one shirt. I think it was around 170 euro delivered to the US, but don't quote me on that. I had him make an adjustment by pointing to where I wanted some extra material in a photo and it came out just right.
I adore Florence, but did not find compelling off-the-rack clothes in my size rather large size. I paid homage at Tie Your Tie or whatever it is now called now and found superb quality, but nothing that made me want to drop serious coin. I really wanted to order a pair of Roberto Uggolini shoes--his atelier was well worth a visit. But he requires a second fitting and I was not coming back to Florence and his schedule in NYC did not align with mine, much to my regret. I have a pair of Mannina shoes I had custom made years ago in Florence with one fitting, but the process turned out to be a pain and I would not do it again with them. Given that the OP is going to be there with limited time and a daughter deserving attention, I think that rules out many of the wonderful bespoke tailoring/shoe operations there. But would love to hear of other gems I might have missed for the next visit.