A midi or maxi with an empire or wrap waist, in a fabric with some give, worn with a block heel or a smart flat. The one thing that matters more than the dress: buy for the bump you will have on the wedding day, not the one you have now. Order in your pre-pregnancy size about four weeks ahead.
Start with how pregnant you will be on the day
This crucial piece of guesswork is important to gauge the type of outfit you will need for the day. The invitation arrives at fourteen weeks and the wedding is in July, by which point you will be thirty-two. Buying for today's shape is a big mistake, and it is the one that ends in a frantic Thursday-night order.
Count the weeks between now and the wedding, then dress for that date. If you are not sure what to expect, our guide to how much bigger you will be gives you a rough timeline to plan against.
Not showing much yet, up to about 16 weeks
At this stage, you have the most freedom. Much of your own wardrobe still works, and a dress with a loose waist will carry you comfortably. The real question here is usually whether you want the wedding to announce anything on your behalf — if not, avoid anything that skims closely at the front, and favour shapes that fall away from the waist.
Mid-pregnancy, roughly 16 to 30 weeks
The easiest stretch, and the one with the most choice. The bump is unmistakable, your shape is relatively stable, and almost everything in maternity wedding guest dresses is designed to look its best right about here. If you have any say in which wedding falls where, this is the window to go for.
Late pregnancy, 30 weeks and beyond
Comfort stops being a preference and becomes the brief. You will be warmer than everyone else in the room, you will want to sit down sooner than the schedule allows, and a dress that looks superb standing still can be unbearable through a three-hour wedding breakfast.
Prioritise fabric with stretch, a waist that sits above the bump rather than on it, and something you can genuinely sit in. Check in advance where you will be seated and whether the ceremony involves standing — it is not a fussy question at thirty-six weeks.
Tips for a maternity wedding outfit that works
- A waist above the bump. Empire lines, wrap styles and A-line shapes fall away from the widest point instead of cutting across it.
- Fabric with give. Jersey, crepe and TENCEL move with you and recover after six hours of sitting. Avoid stiff, structured fabrics.
- Midi or maxi length. Hems ride up at the front as the bump takes up length, so anything that was knee-length in the fitting room will be shorter on the day.
- Sleeves, or something over the top. A jacket or fine knit you can remove without dismantling the outfit solves both a cold church and a warm marquee.
Reading the dress code
When pregnant, the dress code can have different implications for what you wear. Below is our guide for interpreting the dress code.
Shoes, which matter more than the dress
Nobody plans for this and everybody regrets it. Feet commonly swell in the third trimester, your centre of gravity has moved, and a wedding involves far more standing than the schedule suggests — drinks, photographs, the queue for the receiving line.
A block heel or a smart flat you can wear from two in the afternoon until midnight is worth more than any garment. If the ceremony or reception is on grass, a stiletto is simply not an option. And if you have the boot space, a second pair in the car is the least glamorous and most useful thing you will do all day.
If you are the bridesmaid
This is a different problem entirely, because you do not choose the dress. Tell the bride as early as you are comfortable doing so, because the lead time is important. Most bridal shops will advise ordering later than the rest of the party and sizing to a date rather than a measurement, and will build in an alterations allowance if they know in advance.
Ask for two fittings rather than one, with the second as late as the shop will allow. If the dress has a fixed waist, a tailor can usually add side panels or convert a seam — but only if there is time and fabric to do it with.
Buy or rent?
This is the clearest case for renting there is: one wearing, at a size you will never be again, in a style you are unlikely to reach for afterwards. If you have two weddings in a summer it is worth doing the sums, but for a single event renting almost always wins. Our guide to rent, buy or pre-loved sets out the arithmetic, and pre-loved is the middle path if you would rather own it.
When to order
About four weeks before, and no later than two. Order in your pre-pregnancy size — maternity cuts build the room in rather than adding it through the size — and try it on as soon as it arrives rather than the week of the wedding, so there is time to change your mind.
If the wedding is more than two months away, resist ordering now and wait until you are about four weeks out.
What to wear to a wedding when pregnant: Frequently asked questions
The takeaway
Dress for the date, not for today. A waist above the bump, a fabric with give, a hem long enough to stay where you put it, and shoes you can still face at eleven at night. Everything else is the same wedding-guest problem everyone has.