When simply using a measuring tape to mark the edges of the trim wasnt giving me the accuracy I wanted, I tried a different approach

Sandro Women's knit midi dress V-neck Long sleeves with ruffled contrasting sleeve ends Button placket Ruffles at bottom of skirt Designed for a tailored fit The model is 179 cm / 5'9 tall and wears a size 36 FR / 4 US Reference: SFPRO04094 COMPOSITION & CARE Composition Main fabric: 53% viscose, 44% polyamide, 3% elastane Tab: 49% polyamide, 46% viscose, 5% elastane Wrist: 53% viscose, 45% polyamide, 2% elastane Ruffle: 64% viscose, 36% polyamide Collar: 49% polyamide, 46% viscose, 5% elastane Care advice Hand wash Do not bleach Do not tumble dry Iron at a maximum temperature of 110C without steam F - Professional dry clean, with hydrocarbon solvent, normal treatment SANDRO RESPONSIBLE & SUSTAINABLE Delivery & Returns DELIVERY Free Standard Shipping Via Fedex During promotional periods, please allow 5-6 business days for your order to be ready for shipment RETURNS Orders can be returned within 30 days of the ship date unless marked Final Sale

You could add a cowgirl hat for extra flair or even glittering earrings and layered necklaces
Jovanis design team knows which fabrics to select for which colors, which dye processes produce the most accurate results, and how to adjust when a color does not translate the way it should
I felt that the UK to US size conversions were true to size as well