How do you transfer weight paint in blender 2.8? I want to transfer the weight paint of my character to my clothes?
You can use Data Transfer Modifier on your clothes mesh and select Vertex Data, Projected Face Interpolated (experiment here), Vertex Groups, All Layers > By Name.
As of the stable release of 2.80, Transfer Weight option is consolidated into Transfer Mesh Data, and now located under Object > Relations > Transfer Mesh Data. This option is already available in Object Mode, no need to enter Weight Mode and accidentally paint a weight data in the process.
However, the selection order for the Transfer Weight is somehow reversed. So, instead of transferring weight from the first selection to second selection, it's actually vice versa in 2.80 - the tool transfers weight from the second selection to the first selection.