Kiltmaker Wage

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Hi,
I'm about to graduate from a kiltmaking course and became keen to continue into kiltmaking work until I realised late in the day what the rate was.
I was advised that per kilt £85-£100 is offered based on an 18 hour make time and that this rate was in keeping with the industry standard in Scotland when kiltmaking for a highlandwear company - surely this cannot be right. Please could anyone with relevant knowledge of, or experience with, Scottish kiltmaking rates for retailers offer any insight into the validity of this?
At £100, this would equate to £5.56 per hour and as the minimum wage in Scotland is £8.21 I am finding it difficult to fathom how this can be the case for skilled work of this nature (fully hand-stitched, bespoke kilts). Information and clarification would be greatly appreciated, many thanks for your time.