Wedding invitations arrive in clusters. You get three for one summer, two of them have the same twelve people on the guest list, and somewhere between the second and third you start doing arithmetic about how much each afternoon is costing you.
The usual advice is to buy three dresses. The better answer, most of the time, is to buy one dress that can carry all three days and change everything around it. This is less about thrift than about how occasion dressing actually works — the dress is the smallest variable in what people remember.
Choose the dress for the most formal of the three
This is the ordering that matters, and most people get it backwards.
It is straightforward to dress a formal dress down: flat sandals, bare skin, hair left alone, no jewellery. It is close to impossible to dress a casual dress up. A jersey maxi with heels and a statement earring is still a jersey maxi.
So look at your three invitations, find the one with the strictest code — the black tie optional one, the one in the cathedral, the one at the country house — and buy for that. The other two become easier by definition.
Buy print, not block colour
Two reasons, one aesthetic and one social.
The aesthetic one: a print photographs with more depth under the harsh light of an outdoor afternoon, and it hides the crease that appears across the lap of every seated guest during the speeches.
The social one is the point of this article. A printed dress is genuinely harder to recognise as a repeat than a solid colour. Change the accessories and most people's memory of a busy floral maxi from six weeks ago will not survive the comparison. A plain emerald dress is remembered exactly.
If you already know two of your weddings share guests, this alone decides the question.
Prefer a fabric that survives a car boot
Occasion dresses spend a surprising amount of their lives folded in a bag in a car, or hanging in a hotel wardrobe that has no steamer near it.
Chiffon and lightweight woven fabrics recover from being packed. Heavy satin holds a crease and announces it. If two of your three weddings involve an overnight stay — and at least one of them will — this is worth more than it sounds.
What to change between the three days
Here is where the work actually happens.
Shoes
The biggest single shift in how formal an outfit reads, and the cheapest to own three of. Block heel for the lawn, a proper heel for the hotel, flat sandals for the registry office and lunch. The dress does not change; the register does.
The layer
A tailored jacket over an occasion dress makes it a daytime formal outfit. A fine wrap makes it an evening one. Nothing over the top at all makes it a summer afternoon outfit. Three completely different photographs, one dress.
Jewellery
One statement piece at a time. A strong earring with bare ears empty of anything else, or a necklace with small studs. The rest of the time, less. This does more than people expect to shift an outfit from one wedding to the next.
Hair
Up for formal, down for relaxed. This is free, and it changes the photographs more than the shoes do.
Bag
A clutch for the formal one, something with a strap for the day you are on your feet from noon.
Which shapes take this best
A printed maxi with sleeves is the single most adaptable occasion piece, because the sleeves solve the church problem and the length solves the seating problem, and the print solves the repeat problem. Clemence and Rowena both sit here.
A chiffon maxi does the same job in a lighter register and packs better. Verity is the version of this we would take to a wedding abroad.
A satin midi goes the other way: it is the most formal of the three, it dresses down least easily, and it is the right answer if two of your three weddings are evening receptions rather than garden afternoons. Odette is cut for that.
If you want to see the range in one place, Wedding Guest and Dresses hold most of it.
The arithmetic, honestly
One dress at eighty pounds worn to three weddings costs less per wearing than three dresses at forty. That is the obvious half of it.
The less obvious half is that the second and third wearings are always better than the first. You know how it sits, you know which shoes you can actually stand in, you know whether you need the wrap by seven o'clock. Nobody looks entirely comfortable in something they are wearing for the first time, and weddings are photographed relentlessly.
When to break this
If two of the three weddings are back to back — same weekend, overlapping guests, and you will be in a hundred photographs at both — buy the second dress. This article is about efficiency, not about being stubborn.
And if one of the three is yours, none of the above applies.