I use 010 Editor but as it was said, any hex editor will do the trick. The hex view looks the same in them all.
Yea I suppose hex editing can feel a bit intimidating if you're not at all familiar with it. Here's two save files. One at the end of current content and another at the very beginning. I've also included the files to remove clothing restrictions so you can use any clothing item with any outfit. Pretty much everything should be unlocked for every character that matters.
Save files go to "My Documents\SeasideMystery" and the files in the "resources" folder go to "{game folder}\Seaside Mystery_Data\resources".
I take no responsibility for any issues these may cause. Use at your own risk!