Whats the difference between kasah (covering) and labash (covering)? And when we look to clothes then what's the difference between kesut and lebush? And what about beged (cloths) ? Please show me some examples from the Torah, and define them for me.
Malbim has an entry in his "Ya'ir Or" about different words for clothing. I will summarize his opinion regarding the words you are asking about.
- בגד: This is a general term that refers to all types of clothing. (E.g. Exod. 29:5, Judg. 14:13)
- כסות: A garment that is not intended to be worn in the normal way, but rather to just cover up with. (E.g. Job 31:19)
- לבוש: A garment that is not intended for everyday, every-person wear, but rather for special occasions or special people. (E.g. Esther 4:2, 6:8; Prov. 31:22)
Now for the verb forms, it's kind of the same idea:
Chosem Tachanus page 166 (by Abraham Bedersi) explains the following differences. The word Levush is the standard word for clothing. Beged is something which is not worn - for example U'beged Klayim Shaatnez. Kesus is used for something that covers over. Simla is something you lay upon. Meil is a valuable type of clothing which prestigious people wear.