Did He Change His Clothes ?

Parshas Hashavua

וישמע הכנעני מלך ערד ישב הנגב *    

Rashi explains that it was actually עמלק who was ישב הנגב but

disguised himself, by speaking in the language of  כנען 

so to confuse the Yidden when they will Daven to Hashem 

to save them from the enemy כנען instead of עמלק

Since they  wore Amaleiki clothing the Yidden

realized something doesn't make sense and Davend 

without mentioning any name of the enemy.

The Kalir in the Piyut of Shabbos Parshas Zachor writes

זכור יושב הנגב בלי על כערד כסות ולשון שנה

Seems that the Kalir holds that he changed both, his clothing

and language.

The (מהרש"א (ר"ה ג ע"א 'ר claims we can say that the

Kalir & Rashi are not arguing. The meaning of כסות ולשון שנה

is that the כסות didn't match the לשון since he wore Amaleiki

clothes and spoke Kanani language. (like Rashi)

*Bamidbar 21:1