I live in a very dusty area. The only feasible way for me to protect the crafts from dust is to wrap them in transparent polythene sheets.
These crafts are placed on the table and some are hung on the walls.
What would be the way to keep them in the polythene sheets without making them look shabby?
Intension here is that it shouldn't be obvious to the onlookers that the thing is in polythene just to avoid dust!
Wrapping anything in polythene is inevitably going to have a profound effect on its appearance, there is no way around that.
A better solution is to display them in a closed case or cabinet with glass (or similar) sides or windows, these vary in design from very modern looking all perspex cases to more antique looking wooden framed ones (google 'display case' for countless examples.
There are also other similar solutions, you can get glass or acrylic bell jars reasonably inexpensively.
Two dimensional work can be framed behind glass.