This word is often used for clothing cardboard. It's actually quite simple. The fabric is flat, but the human body is really three-dimensional. When you cover the human body with fabric, there will be more fabric in some places in order to fit. The place where these extra fabrics are removed is called "province". If you don't understand, you can cover the platform with a piece of cloth. In order to fit, some parts of the cloth can be pinched. This is' saving'. For example, the waist of a well-fitting suit will be saved, so that the waist will fit the skin and will not become a cylinder.

The "saving principle" means that "saving" can be transferred, that is, the excess parts of these fabrics can be removed in different places. I can't express this clearly. You can try this fabric on the people's bench. You can push the extra cloth to different places and then take it away. For example, if you want to save money at the waist, you can do it anywhere at the waist, not necessarily on both sides. This method of removing off-site allowance is "eliminating classes".

For example, if you make underwear, we will simplify it. You cut a knife on the circular cloth and overlap a part of the sector with a certain radius, so it is easy to make a cone. This is to turn a flat cloth into a three-dimensional one. The overlapping part is "province" On this circle, you can save on any radius. This is the so-called "class saving".

I don't know if I understand what I said. I hope it helps you.