Midis are easiest to judge by the point where the waist and hem land together. The brown Floriana Sleeveless Square Neck Midi Dress uses a structured bodice and draped waist, then falls to mid-calf; I would pair that with a simple heel and keep the bag small. In pink, the Tova Midi Dress is a strapless sheath with floral lace appliqués and a back slit, more graphic with a clean sandal than extra jewelry.

The yellow Ilana Floral Appliqué Midi Dress is another fitted strapless shape, this time with dimensional flowers, while the blue Chantelle Midi Dress has a square neck and 3D details over a bodycon line. For less floral emphasis, Vinyles comes in mint with a mesh overlay, floral decals, removable adjustable straps and a back vent. The pastel-purple Hope Midi Dress has appliqués too, but its heavier crepe finish gives it a different feel.

The Roselle Frill Midi Dress takes the rose print from the mini grid down to tiered frills at mid-calf, and the white Gabby Chrysanthemum Appliqué Dress keeps a clean column under chrysanthemum appliqués at the shoulders. The Flora Midi Dress is the strappy floral lace option, while the strapless Arden Midi Dress starts pale blue at the bodice and turns into a garden print toward the hem.

With a midi, I check the slit sitting down, then stand and take a full stride. I would wear Priselle's sequined mesh with a plain wrap or coat on the way in, and the steel-blue Elisa with its boned bodice and sequin flowers when I want a cleaner neckline. What I would skip: making a strapless midi the choice for a long evening before trying it with arms overhead and sitting. The bodice should stay comfortably in place through both.

For a maxi, I look at the hem in motion before I decide anything else. The wine-red Florencea One Shoulder Maxi Dress has asymmetric ruching and floor-sweeping length, so I would wear it with a low-profile shoe and let the fabric do the drama. Simone, in chocolate brown, keeps the one-shoulder line and ruching but adds a front slit; it is a more relaxed route when the event calls for movement.

The black Reina 3D Floral Maxi Dress puts the flowers up on the square-neck bodice before a sheer lower panel, while the cream Scarlett Maxi Dress uses 3D flowers across a fit-and-flare shape. Reina focuses the eye at the top; Scarlett carries detail throughout. For print and volume, the Elliatt Armani tiered maxi mixes yellow flowers with a high-low hem; Tilly takes the opposite approach in black tiered chiffon, adjustable straps and ruffles.

Coralie's steel-blue satin is ruched, mocknecked and slit at the side; Clementine in sage trades that for a cowl neck, adjustable straps and a high side slit.

For the floor-length gowns, the white Rina Embellished Gown is covered in 3D flowers and is the one I would save for a black-tie room. The plum Rosaria Printed Ruffle Tiered Gown sits nicely beside the Armani, and the pink floral Solene Halter Gown cascades ruffles from a high halter neck. The white Elizabeth Asymmetrical Gown is the outlier, with a halter V-neck and a ruffled high-low hem that shows the shoe. A side slit can look striking on a hanger and feel different during a real stride, so I test the hem walking and stepping up. I keep jewelry and shoes low-key whenever the neckline or surface already has the story.

I would look at the invitation first and decide how formal the room actually feels; then I would choose the length that suits the plan, not the photo. For an afternoon, I would compare the minis with a light jacket. For dinner, I would look at the midis and test the bodice, slit and sitting comfort before committing.

Then I would decide whether the dress needs a quiet shoe or a simple accessory, not another focal point. Finally, I would walk, sit and turn once in it. The real test is whether I stop thinking about the straps and can enjoy the night. If you want to keep browsing, I also put together The Midi Dress Length That Works On Everyone and Mini, Midi or Maxi.