No need to poke holes, what you need is already there.
You have to have a Japanese medal bar for your decorations if you want to display them on the uniform. The clasp of the bar will go through the small vertical loops and the backs of the ribbons on the medals (on the bar) will go through the horizontal loops. Here is a complete medal bar (see link)...you will have to search some more on this sub forum to see what the back looks like on one of these. The medal bar apparatus does show up on ebay.
http://www.wehrmacht-awards.com/foru...ight=medal+bar
The way the stitching is configured on your uniform it could also otherwise just accommodate a ribbon bar.