I'm looking for sheer, white curtains that fit (ETA: and can be shifted downwards enough to completely cover) small windows such as 'Breeze-easy Windows' "Double Hung" Deluxe' (the window I used in my screenshots). Ideally, the curtains would only be sheer without any lace on them.

The ones I managed to find so far are recolours of the Jeneva curtain at TSR (mesh and recolour). The problem with those is that the short version is just a recolour of the long one and, therefore, cannot be shifted down low enough to properly cover small windows. Also there is lace on them. In the picture below you see recolour (left) and original (right) shifted to the lowest possible position.



I tried to circumvent the problem by placing the curtain on an OMSP on the floor below and shifting them upwards into the next story. But that's a pain to do in a house full of windows. Also if you go down a floor, the curtain alone is still visible hanging in mid-air (as you can see on the right side in the following picture).



I also found these recolours of Pocci's sheer curtains. Look-wise they are exactly like the type of curtains I'm looking for because they're just sheer without any lace. The problem is that the short version is too big to nicely fit small windows.

Fanseelamb has made edits: http://www.leefish.nl/mybb/showthread.php?tid=4837
But you need the original mesh by @Hugelunatic : http://sims2artists.com/index.php?topic=4301.0

The problem I encounter with the Pocci curtains is that the mesh turns black when I shift them down.

With those I have the same problem as I mentioned above with the Jeneva curtain. The short version is just a recolor of the long one and this is as low as you can shift them downwards:

I've added a short version of the contempo curtain. This sits at floor level and will shift up. Repo'd to the main, and has diagonal.

This is exactly what I was looking for! Thank you very much!