New clothing during the 3 weeks

Tisha B'av and Fast Days
1

Is it allowed to wear new clothing during the 3 weeks. Is it allowed to buy clothing? Any difference if it’s a sale?

2

Now clothing until Rosh Chodesh Av is allowed. After Rosh Chodesh and during the 9 days, for Ashkenazim, brand new clothing are not allowed, and for Sephardim only during the week that Tisha bAv falls out (Shavua Shechal bo)

3

To purchase new Clothing but not to wear them would that be ok?(eg. Big sale , or boys going to yeshiva right after the 9 days)

4

Not allowed