Following link is the link to the award and provide you full particulars of your right and responsibility under that award.
There is no requirement that says how many uniforms your employer must provide you with, but it does set out that when you receive the uniforms you must sign for them.
If they are not providing you with the right sizes then I would suggest that you file a complaint for mediation with Fair Work Australia to resolve the issue between you and your employer.
Under part 4 of the award on pages 17 to 29 it sets out all the wages and what you should be paid for the work that you do.
If you have any issues about being underpaid or incorrectly paid this will assist you.
If your employer intimidate you because you are going to lodge a complaint I would suggest that you have a legal representative write to them and confirm your rights.
I also understand that under the hospitality industry there is a union and you can contact the ACTU and they will provide you with the details of the union that represents you.
Their website is as follows:
Is there any other thing I can assist you with?