Custom shower doors, cut to your opening

Custom does not mean expensive for its own sake. It means the glass is cut after someone stands in your bathroom with a level, so the panel fits the room you have rather than the nearest stock size.

That matters most in two places: old shore houses where a century of settling has moved the walls, and new builds where the tile setter worked to the room instead of to a plumb line. In both cases a stock door leaves a wedge of daylight down one edge.

If your opening appears square and standard-sized, note that in the form; an independent installer can advise whether a stock-size door is suitable.