I want to clip my horse (for the first time) is enough two rug (a cotton rug and 200g rug)?

It will depend on the temperature and what type of clip you do.
Depends on your country's climate and temperatures. Here it's 5-8°C at night and around 15°C during the day, so the clipped horses wear a 200g rug. When it gets colder we put a 100g or 200g rug on top of it at night.
It depends on what temperatures there are at youre stable. I personally think a 200g rug isn’t enough. I would recommend a 300g rug.
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