Let's say you were commissioned to develop the convertible soft top for a 250 mph+ supercar.
If you say it can't be done, then you are shown the door and you wasted your once in a lifetime opportunity to get a dream job at a supercar manufacturer.

They need a soft top as it's huge mid-engine leaves no room for a retractable hardtop.
Also the market segment calls for a convertible with power operated roof. No manually folded roofs or take out and stow away targas are allowed.
Also some soft top nostalgia.

Maybe you will need a super-strong fabric like those used in seatbelts or Kevlar?

Maybe the fabric can be knit curved to both be made in one piece and to have its curved shape enhance aerodynamics? Pretty much like those hand knit half-sphere shaped crotchet hats.

Maybe you can allow the custom knitting to get bow attaching points included in one piece.

Maybe you can get a superstrong, (300 mph) wind resistant outer fabric even if it allows some water to leak down, and get a second weather resistant fabric underneath?

How would you design the folding mechanism and supporting bows to withstand 250mph aerodynamic forces?