There are many tutorial about cloth making/ sewing/ adding cloth to chara (not modeling) in blender… there are even some paid addons… just try your favorite searching machine…
Just one random example: a playlist from PIXXO 3D on YT:
YT may show you dozen of other tuts on this selection…
Edit: Video thumbnail is showing in edit preview but not availible in normal page ??? you may have to search for this ??