Bathrooms are very personal space, so choosing a blind that maintains your privacy is a big consideration. Venetian blinds are an obvious choice for this reason as they allow you to tilt the slats to obstruct any views from outside. Roller blinds too will give you total privacy, with light levels depending on the fabric you choose.
If you are looking for a more tailored solution, a floating style, or Transition blind like the ones pictured here are the perfect answer for bathroom privacy. Unlike traditional blinds, these are moveable within the window space allowing you to position the blind exactly where you need to for privacy without blocking all of the light coming in from outside. You can have this style in both Duette® blinds and Pleated blinds.