Avril by rue de seine help

Hey guys I'm a budget bride I'm generally a tomboy I never wear dresses ever and I wear mostly loose clothes bc of my 7 year history of anorexia my fiance has finally helped me over the past 5 years recover from. I so want to wear a more fitted dress for the wedding for him when I never wear dresses I'm obsessed with the rue de Seine avril dress it's the one I've just been unable to get out of my mind and I feel I could maybe feel confident wearing. but it's super pricey so if anyone is looking to sell used I would be forever appreciative I get so much anxiety trying on dresses bc of my past were 9 months out everyone keeps asking about the dress and I haven't been able to bring myself to deal with the dressing room mirrors or trying things on I'm honestly worried I'll end up with a rack dress bc I'll put it off till the last minute possible and just hate my dress