Fit and flare dress - hard to sit down in

So with two weeks to go tried my dress on again tonight and it fits perfectly and looks amazing when stood up (it’s a fit and flare dress so is fitted) however it is very tight to sit down in. Is this the norm for these types of dresses? I’m terrified of it ripping!
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My Planning Thread: https://forum.youandyourwedding.co.uk/your-planning-threads/435375-our-country-house-wedding-p1.html
My Report Thread: https://forum.youandyourwedding.co.uk/your-wedding-reports/486792-our-country-house-wedding-the-report.html