Dress regret - feel like it’s lacking something

Hello! Long time lurker and on a throwaway. I wanted a simple, long sleeve dress and found this (Charlie Brear Elua) as a sample and purchased last month. Wedding is in November and first fitting is coming up soon - please help me work out what I need. The skirt feels like it’s looking a bit sad - would a petticoat work? Or maybe an overskirt? The chevron design is looking odd on me but seems to work okay in model pics so hoping it’s just because the dress hasn’t been fitted to me yet and isn’t quite sitting right?

Ignore the sleeves here - we were playing around with lining the top and sleeves so I can still wear a regular bra. What are peoples thoughts on that? Don’t want to completely hide the lace but also want to feel comfy and supported on the day!

Thank you so much - this sub has been such a lovely and helpful resource the past couple of months. All the dresses on here are amazing and I can’t help feel a bit plain in this so appreciate any advice to help me make it seem more ‘wow’ ❤️