A high floral neckline with short sleeves creates another upper line from the clear-shoulder examples here. Larger pale flower forms continue over bodice and shoulders. The neck edge sits higher with an irregular drawing. A prominent head ornament adds pointed forms above the face. The complete lower length is missing, so this photograph cannot supply a finished hem plan for your garden route. Use it specifically for the neckline and short-sleeve preference.
Compare the intended coverage at neck and arms first. You may enjoy this higher drawing while seeking a quieter skirt, or prefer a similar sleeve height with fewer projecting motifs. Both are specific preferences to investigate through actual offers. You do not have to adopt the whole dress to describe one useful starting point.
Begin the jewellery trial without another necklace. Add a headpiece separately afterwards and inspect the spacing between face, neck edge and shoulders. The picture says nothing reliable about cooling, warmth or internal construction. Introduce shoes, full length and any outer layer on the real candidate later. Clear shoulders are not compulsory for a celebration in a garden.