On the slider wall, I would do curtain as if there are two set of windows the same size. This will leave a wall gap between for the eye to rest. This is a bad example but I'm on my phone but hopefully the image helps.

I’m a bit challenged trying to visualize this room as a whole. I think that how much use for going in/out the sliders needs to be factored in. The front slider next to the window is the most challenging IMO since there’s no room for any window covering to stack completely off the glass on the fixed panel side of slider. I agree the same fabric & treatment should be used for all windows. I think I would hang separate drapery panels over each window. For the front slider & window I’d use the same length panels for both slider & window for a better look when closed. That slider - I’d have drapes that open in middle & pull to each side. The corner fixed panel will always be partially covered with the open panel on left. The drape for panel that slides should stack completely off the glass so that door handle can be easily accessed. The window would be traditional drape open in middle & stack completely back off glass on both sides. Two rods for each window - sheers on inside rod & drapes on outside so the 2 coverings can be open closed separately. When closed, this wall would appear as a complete wall of drapes. As for color - don’t know if you’re wanting dark blue or thinking that’s room darkening. Room darkening drapes are available in many colors. Slider in dressing area should have same treatment but sounds like with 16” space on each side the drapes can stack completely off the slider on each side. Whether that slider has sheers or not depends on the privacy issue. Maybe only drapes on that one - no sheers.

Thanks for the feedback!

Jesse Fay - I appreciate your perspective. I was torn between separating the two sets of curtains on that wall, or just doing one continuous run of curtains all the way along (that could open over the slider and window as needed). I think you are right about it being better to have some wall space showing around the window.

KW - Thanks for the feedback! I do really want the same treatment for sliders and windows, glad to know you think that too. I am leaning towards have a little wall showing around the window when the drapes are closed, but the wall will definitely be mostly covered in drapes! Neither of these sliders are used frequently, so having easy access to walk out the opening side isn't really an issue.

The choice of dark blue drapes is a secondary question... I am considering the dark blue becuase I feel it will complement my overall decorating color scheme (not necessarily because I expect it to be better at room-darkening). My concern is more about the aesthetics of having the large amount of dark colored drapes contrasting against the light Ivory off-white walls... I've never put up dark drapes like that, and am inexperienced at judging their potential impact. I was wondering if anyone had any advice from experience of how I should be considering that impact.

@Chris A Dark color drapes against a light wall can be quite fine I think. The success, or failure of the look will depend on how all the components pull or play together in the room. Is the furniture also dark & is there a headboard with a fabric & what about the bedding? I Googled images ’dark color bedroom drapes’ & lots comes up. Dark drapes, same dark color on walls, white bedding/ dark drapes, light color walls, dark furniture, light bedding. Dark drapes have potential to create a moody, cozy feel for a bedroom. I’d suggest looking for the images & see what combos appeal & find some with furniture similar to what you have for ideas.