Because the tolerance of digital cameras is relatively narrow, if you are not sure, you would rather be slightly underexposed than overexposed, otherwise the details will be lost and cannot be retrieved.
Using the average metering mode, you can get more accurate exposure of clothes and background in most cases. If you are shooting pure white clothes such as wedding dresses, you can use spot metering.
The flash is farther away and the light is softer and more uniform.
Using tripod, that is, natural light shooting, plus reflector, can also achieve good results.
If you want to get the effect of almost no shadow, you can use the camera to angle the two lights at 45 degrees.
Try different lighting angles and different light ratios, and you will always find the effect you need.
After finding the best light distribution angle, you can get accurate exposure by shooting several groups with different exposure combinations, and you can get perfect results with a little correction later.