I put my iron-ons on some scrap knit material (which won't need to be hemmed), and cut loosely around the images. I pinned them where I wanted them on my shirt.
I tried sewing this flower on first, but then took it off because my presser foot rubbed the transfer loose.
I went ahead and sewed the MOPs emblem on but was more careful about rubbing it with my presser foot. Then I trimmed close to my stitching. I still wanted some decoration (I wanted to cover up an ink stain by the armpit) so I cut out freehand circles and pinned them in place.
I attached the circles with a straight line sewn through each. If you want less floppy dots, I would suggest sewing another line to make an X pattern. There it is! (Check out those arm veins I inherited. I'm great at giving blood, but maybe I should consider posing with my arms over my head.)