Not sure if this was already discussed but I just wanted to share a fix to a problem I had when I imported kits that I think new players like myself needed. If this was already discussed, please do what you must.
I used to have a problem on importing everything except Brazil kits.. then I downloaded the FM Editor in game. U will need it if you are a kit guy like myself.
Download the FM Editor (I know, hold that L as you pay $5 for it). Then , extract the kits in your Graphics folder (there are a bunch of places that explain it). Run FM16 as usual and do the regular clear cache, reload skin direction (there are tutorials on it if need be).
Once you do that, you WONT see kits like Brazil Serie A pop open like other leagues... so what you must do is go to the right hand drop down menu located on the top where you can edit things and there will be a selection in the menu saying "Allow Licensed Jerseys", if that isn't checked, click on it and WALLAH MAGIC.. your kits will show up finally.