Hello Arthur, 'don' as a verb would mean to 'put on' , not quite wear but very close. It is an older word which is not so common these days! Best wishes Bob https://www.merriam-webster.com/dictionary/don

"Don" means "put on" rather than "wear". If you don a garment, this describes the action of putting it on. You hadn't heard this word before because it's very outdated. Nowadays we generally only use it to sound deliberately old-fashioned or mock-formal. It would sound ridiculous to use 'don' in normal everyday conversation. So why do journalists and headline writers use it? The answer is simple - it's a very short word.

Hi, I have studied that word as 'wear' or 'put on' you best clothes and it is use in formal occasions.

WEAR and DON are synonymous. Their difference is that WEAR can be written in the simple past form as WORN, whilst DON has not got any simple past form.

I agree with Bob's answer.