If you're looking for some classic style, purchase manufactured "cottage style" windows. Made by a number of window manufacturers, cottage-style windows feature a larger bottom sash than a typical double-hung window but open the same way as a standard double-hung. You can purchase cottage- style windows in wood or vinyl from some home-improvement stores and most specialty window retailers.
If you're looking for a bit of old-fashioned or rustic appeal, try a standard divided window. Divided windows feature pieces of wood or vinyl that seem to divide the window into additional sections. Typically, there are four or more sections on each window sash. You can purchase single- or double-hung divided windows through most window retailers. Divided windows also come in more unusual options, such as picture and casement windows.
If you're trying to retrofit windows to fit your space and can't find what you need, go narrow. Many historic cottages feature multiple narrow windows side by side. If you can't find a standard window that fits in a large window opening, install multiple narrow windows together to add historic flare to your cottage without having it look mismatched.
If you've tried everything for your cottage windows, and standard windows just don't seem to fit, start from scratch and have bespoke windows made. Bespoke windows are custom-made and often feature special details that standard windows don't have, such as Gothic arches and glass panes of different sizes within one window.