Just sharing a way to change outfits, for anyone who is interested.

Look for ESam.ukx in the animations folder, back it up in case of error, and open it with Notepad++(regular notepad or other text editing programs might work, but I did not test).

Look for:

-samAMesh

-samBMesh

-SamCMesh

and just switch the A, B and C alphabets with one another as you like.

The A mesh is the outfit worn in the training mission and most missions. B mesh is the "ninja" outfit. As for the C mesh, I'm not really sure what it actually looks like but I'm guessing it's the one with elbow pads.

So basically, if you want the "ninja" outfit for missions that use the A outfit for example, just change:

samAMesh > samBMesh

and

samBMesh > samAMesh

This will also mean that missions using the B outfit will show the A outfit. So you'll need to switch the alphabets again if you want to retain the same appearance. If you use any other alphabet, I believe Sam becomes invisible as the mesh doesn't load. Also, using the same alphabet for two meshes at once resulted in a crash for me.

That's all :). Apologies in advance for any problems with this post and if this doesn't work or causes problems. However, it works fine for me. Also, thanks GOG for this great game!

Awesome! Thanks for sharing!