you're a little late, aren't you?
I am by no means an expert, but I'll give you what I have learned from my experiences CCW'ing. I tried out many different CCW methods and they all have their pros and cons. Here is the order I tried them in: (all with a Makarov unless noted otherwise)
1. Inside the waistband (IWB) - this method seemed to offer the greatest concealment, but it was uncomfortable for my (somewhat) slender frame when sitting in the car or somewhere. I know you are skinny so you may have the same issue. But honestly, this is probably the most practical and best all-around method.
2. ankle holster - this method put the weapon in the most "out of the way" position, but you are limited to wearing pants (obviously) with this method, and pants that are long enough so it doesn't stick out when kneeling or sitting. I also feel lopsided when I walk since there is that weight on just one leg. However, for occasions when I might have to dress up, this is the prefered method as IWB is not applicable with a tucked in shirt/tie combo.
3. elastic bellyband - this is my favorite method because it is most comfortable and works with my medium-framed XD and revolver as well as my Makarov. It tucks the weapon securely away under my arm(s) and even has a spare mag holder. It is less practical when wearing a shirt that is tucked in for obvious access reasons, and it might be a little more obvious than the other methods unless you use a loose enough shirt.
honorable mention:
4. outside the waistband (OWB) - I have a couple of OWB holsters but due to size are really only applicable for open carry, so I haven't ever really CCW'ed them. Although I may come this winter when jackets are back.