Getting the dress first: pros and cons?

A little background: my fiancé and I are recently engaged, and beyond talking about what we want from our wedding, haven’t made any plans. Despite this, when I visited my home country over the holidays, I thought it would be fun to look at dresses with my mum. I was perhaps naïve in this, because despite my intention to only get ideas about shapes and fabrics, I found a dress that feels like *the dress*.

So my question is: is there any reason why I shouldn’t get the dress first?

The main pros as I see them are that I love the dress; it suits a range of venues and seasons; and, in the somewhat likely event that we plan our wedding at short notice (due to family health), it’s all sorted and ready to go. If I order it by Monday, I can also conveniently align a planned trip home with an alterations appointment.

The big cons are that it feels weird to purchase the dress before settling any other details; it’s more than I’d planned on spending (but not unreasonable); and if our engagement ends up being longer, I’ll have to sort out storage and logistics.

I’m not worried about my body changing (it’s a forgiving shape anyway) or my tastes changing. I’m mostly nervous because I really didn’t expect to find such a great dress so quickly.

What are your thoughts, Weddit?