I would recommend checking out the How To Guide on selecting the correct plate carrier, found by using the link below.
https://www.opticsplanet.com/howto/how-to-select-a-plate-carrier.html
The NcSTAR VISM Plate Carrier W/External Hard Armor Pockets is a plate carrier. You can use your own soft armor or hard plates inside the carrier. By itself it is not bulletproof.
The NcSTAR VISM Plate Carrier W/External Hard Armor Pockets that I would recommend is the size medium. It is also adjustable so you will have the ability to make it slightly bigger if necessary.
This is just a carrier for plates or soft armor and is NOT bullet proof.
Yes, this has adjustable straps.
You would want the one labeled as med, which goes from size med up to 2XL, according to NC Star.
Medium should work for you.
No, this carrier does not accept side plates.
No, this carrier cannot accept side plates.
This carrier does not accept side plates as is. However, in front and back it can take plates up to 11"x14" in size.