Wise because you'll get more income but make sure you'll have time to get some rest. My dad worked two jobs when my family moved abroad for a few months, 12AM-7AM and 12PM-5PM.
If you can do both, OK - but do note neither job usually cares that you have another job until the two conflict, and that's 110% your problem, so don't whine about being double booked one day. That's your problem to solve and might involve pissing off one of your employers.
You can do it. I have a friend who works 3 jobs. But make sure you have time to sleep
Hundreds of people work 2 jobs, or more. As you did not tell us how many hours you do at the coat factory we have no idea whether you could cope with both.
You could do both during the summer but you may have to chose one of the jobs to work for during the fall.