In fashion it is common that items contain multiple item dimensions (Color, Size or Style).
An item can e.g. have over 100 colors, sizes or styles.
When using multi-select on an item dimension the display string (containing all these sizes, colors or styles) easily exceeds the 255 characters.
To prevent errors in the selection process the display string is limited to max. 255 chars and displaying intact item dimensions only.
Actual selection is done with all selected item dimensions.
This applies to the item dimensions Colors, Size and Style.