where
how
like this:
Step 1: Find a high resolution picture you want printed.
Getting a reasonably high resolution source picture will definitely help in getting a high quality print. I used Google image search with a size constraint found under search tools.
Step 2: Measure your parka
I'm very particular about dimensions so i measured my parka to get a good idea of how big/small the print should be.
Step 3: Get your image printed on a tee
There's a ton of cheap custom tee printing services out there. If you're in Australia like me, i used Vista Print which was the cheapest. Remember to use the measurements you took of your parka in step 2. The site should have some general information about the dimensions of their default print area. You can use this combined with your parka measurements to re-size accordingly.
Pro Tip: Getting the print done on a tee in the same color as your parka will help you later on. I had a tough time making sure i cut out the box exactly right in order to have no obvious white bits showing on the dark green background of my parka.
Pro Tip 2: Print both sides of the tee with the same image. This will give you a back up in case you botch the first. On top of this, getting 2 sides printed on the same tee is cheaper than getting 2 tees printed.
Step 4: Order some Iron-on adhesive. Make sure to get the ultra hold / permanent version.
This will be the stuff that will paste your art work on your parka. MAKE SURE YOU GET THE ULTRA HOLD not the regular. The regular version is for temporary pasting.
If you are like me and have never heard of / used this stuff before, search youtube for some tutorials.
Step 4.5: You got your tee delivered! Celebrate!
Look at the tee, check the quality of the print. Is it good? Detailed?
My print here is not THAT detailed i admit. However, i think it adds to the feel of the image.
Step 5: Size up the print on your parka to figure out exact positioning.
Step 6: (IMPORTANT) Iron on the rough side of the adhesive to the tee FIRST before cutting.

Please learn from my mistakes. Cutting the box out then trying to iron on adhesive while making sure the edges don't get wonky is super frustrating.
Before you cut out the print, iron on the rough side of the adhesive to the inner side of the tee. Make sure you iron-on an area bigger than the actual square. This will help you to :
a. Make sure the print is sticking to the adhesive uniformly.
b. Make sure the full print including all the edges are properly sticking to the adhesive.
c. The edges of the print stay firm and straight.
Step 7: Cut out the picture
Cut out the picture using a pair of scissors. Remember we still have the adhesive ironed on to the under side of this now.
Step 8: Remove the film covering the second side of the adhesive and iron onto your parka!
Take off the film of the second side of the adhesive and iron on the picture on the parka.
Pro Tip: Before trying to iron it on, measure out what the exact middle of the parka is and draw guidance lines with a white pencil so you can be confident that the box is centered and straight.
Pro Tip 2: Make sure your parka is relatively clean, dust will mess with how strongly the adhesive can stick to the fabric.
Step 9: Let the thing dry for 48 hours.
The adhesive i was using told me to dry for 48 hours.
Step 10: It's done!
Source:
https://www.reddit.com/r/streetwear/comments/4ac6b0/tutorial_on_how_to_attach_prints_on_your_parka/