Completed in the first half of the month 75,000 * 4/5 = 60,000.

75,000 *1/3 = 25,000 will be completed in the second half of the month.

Actual completion 60000+25000=85000

The garment processing quantity is 85000-75000 = 10000 (sets).

This month, 10000 sets of clothes were processed more than originally planned.