Meet the expert: Donna McCahill is the owner of Gloucestershire-based bridal boutique Posy & Pearl stocking designer bridal gowns, bridesmaids' dresses, occasion wear and flowergirl designs, plus a collection of bespoke bridal headpieces and jewellery that are handmade on-site. Donna says: For an intimate outdoor wedding, something informal would work perfectly like a boho-style dress with simple spaghetti straps or a soft, floaty A-line gown with a short train. Consider a design with a pastel undertone, for example, rose or blush, topped with a soft layering of delicate ivory lace. With the uncertainty of the great British weather, you could opt for an overlay that can be removed like a lace bolero that's still delicate and informal but adds an extra layer for warmth.