“Since this dress is cotton, how much will it shrink when washed/dried on cold/cool settings; do you have any idea if this dress runs true to size? I tend to wear a medium but on occasion I need a large depending on how much the material shrinks over time and how the size tends to run so your answer will help me decide. Thanks”
If washed in cold water and dried on cool settings. It should have minimal if not any shrinkage.