In order to attach a lamp shade to a light fitting it is common to use a gallery (or fitter).
https://edisonlightglobes.com.au/lamp...
Our galleries are made to attach to E27 or B22 lamp holders so that a “gallery style” glass or metal shade can be attached to a pendant or light fitting. For E27 lamp holders choose 38mm opening. For B22 choose 28mm opening. We can also arrange components to install in E26 120V systems.

A range of glass lamp shades can be installed this way for effective installation.
https://edisonlightglobes.com.au/prod...
Also a range of metal shades that use either a gallery system or non gallery attachment.
https://edisonlightglobes.com.au/meta...