A lot of pro gig photogrophers do what you suggest and rely on apeture priority, but I have tried it and prefer shutter priority. If you use a shutter speed that you know will stop the movement, but there is not enough light, then you will get the maximum apeture of the camera and proably an underexposed, but sharp, shot. If you shoot raw you can push this back a couple of stops (but this will generate noise). If you shoot aperture priority and there is not enough light then the shutter speed drops and you get a correctly exposed shot, but it is blurred and you can't do anything with.
Well that's my theory any way - I could be talking rubbish!
But I would just experiment and chimp the results and see what best suits you. You might have enough light at max apeture to get good pics if the cloths are well lit.
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