I think we've done OK with the merchandise so far, but there is always room for improvement. I agree we have too much black in the range and more colourful items are required.
Given we are a largely winter sport, it does make sense to have more hoodies, beanies, scarves, and jackets. We don't need more training tops or polo shirts. Yes - good to have playing shirts which are your basic items.
I would like to see more blue and some white items of merchandise.
You could also provide the items that people always love - key rings, mugs, stickers, water bottles, and caps. These are items that you purchase in bulk and sell over 2-3 seasons to reduce costs.