Mermaid Formal Dresses: How to Pull Off the Look

Mermaid dresses are one of those things that look absolutely incredible when they work — and a bit awkward when they don't. The difference is usually not the dress itself. It's knowing what to look for before you buy.

So what actually makes it a mermaid?

It hugs you from the chest all the way down through the hips, then flares out somewhere around the knee. Where it flares matters more than people realise. Lower flare = more dramatic, but you're taking shorter steps all night. Higher flare (sometimes called trumpet) gives you a bit more room to move. If dancing is on the agenda, go trumpet. If you mostly want to look incredible in photos, go full mermaid.

Will it actually suit you?

The silhouette works best when there's a visible difference between your waist and hips — not a size thing, a proportion thing. If you've got that natural curve, the dress just follows it and does all the work. If you don't, it's not a dealbreaker — look for styles with ruching or built-in boning that creates the shape. Just avoid anything very stiff or structured, because it'll sit on you rather than move with you, and that's when it starts looking uncomfortable.

One thing that trips people up: if you're on the shorter side, a very low flare point can cut your leg off at a weird place. A trumpet cut or a style with a bit of a train tends to be more flattering. Worth trying both if you can.

Fabric — the bit most people don't think about until it's too late

Stretch crepe is probably the most underrated option. It holds its shape, moves with you, and doesn't show every little thing. Sequin fabric is popular for mermaid styles for a reason — it catches the light every time you shift your weight, which looks amazing when you're walking into a room. Satin is high-impact but less forgiving. If the fit is even slightly off, satin will show it.

Also worth thinking about: Australian school formals run August through October, and venues vary a lot. A heavy fabric in a cold ballroom is fine. In a marquee that's warmer than expected, you'll feel it by the end of the night.

You need to practice walking in it. Genuinely.

This sounds obvious but almost nobody does it. A fitted mermaid dress changes your stride — not painfully, just differently. And figuring that out for the first time while walking into your formal in front of everyone is not the vibe.

Put it on at home with your heels. Walk around. Go up and down stairs. Sit down and stand back up a few times. Twenty minutes and you'll have it. Most styles have a small slit or kick pleat at the back of the flare — that's specifically there to help you move, so check for it when you're shopping.

Styling: the dress is already loud enough

An updo or half-up style is the move — it shows off the neckline, which on a mermaid dress is usually the best part. If the neckline is heavily detailed or high, skip the necklace and just do earrings. Small clutch, strappy heel, done. You don't need to add much.

If it's a cold night, a faux fur shawl or satin wrap works well — just make sure the colours actually go together. A warm champagne wrap over a cool navy dress can look a bit off in photos even if it feels fine in person.

Colours that are actually popular right now

Emerald green is everywhere this season, especially in sequin. Champagne and gold work particularly well in mermaid styles because the fabric moves and catches light. Midnight navy photographs beautifully and is one of those colours that's hard to get wrong. Deep burgundy in satin is dramatic in the best way. And black is always the right answer if you're not sure.

Questions people actually ask

What if I'm not curvy — can I still wear a mermaid?
Yes — but be specific about what you're looking for. Ruching, draping, or structured boning will create shape where you want it. A trumpet cut is usually more flattering than a low-flare mermaid if you have a straighter figure. Custom sizing also helps if standard sizes don't quite fit your proportions.

How early do I need to order?
At least 6–8 weeks out, more if you're getting a custom size. Mermaid dresses need to fit well to look right — a slightly-off fit is more noticeable in this silhouette than in others — so leave time for alterations if you need them.

What shoes actually work with it?
Strappy heels or a block heel are the most practical. If the dress is floor-length, your shoes are barely visible anyway, so comfort matters more than you'd think. Nude or metallic goes with almost everything. If you're going for a high stiletto, make sure you've walked in both the shoes and the dress together before the night — not separately.

Browse our full range of mermaid formal dresses, including custom sizing options.