Blinds for a triangular gable attic window

[BlackAlys]

We are currently raising the roof a little and converting the attic space into a bedroom for DD.

As well as velux, there'll be a
full length triangular window at the front of the gable.

How on Earth do I put
Blinds or a black out roman blind to a window of this shape?

I know Pinterest has ideas but I'd much rather hear advice from those who've done it. Thanks!

Hopeful bump

Bumping you too as I'm hoping to do this in a couple of years but the blind question stumps me. Have you seen the bifolds where the blind is built in to the glass? Wonder if that's an (expensive) option

Thanks @beggingforsleep. Blinds2go are meant to be really good at tricky windows so I may be contacting them as soon as the dimensions for the window are bought. I'm hoping it won't cripple us financially because their blackout velux blinds seem super reasonable.

I'll be glaring at DH and architect if this can't be resolved cheaply because they insisted on a triangular gable window and my large circular window idea was cast aside.

I'm also wondering whether the blinds will be sufficient for blackout for sleeping. It's for DD's bedroom so will need to be blacked out, but hey, who needs to listen to me?!

You def need to block out as much light as possible! You'll be taping tin foil to the windows in summer 😂.

It will look stunning though.

Thanks @beggingforsleep
I'll come back and update this when we've sorted it or when I'm bulk shopping tin foil