How much product should I order?

I have an idea for a business, and essentially I will be building a brand. It’ll start out by selling t-shirts. I know, everyone does this, but mine has a difference.Due to this difference, the idea of print-on-demand is completely out the window. I need to order stock in advance to then sell.So do I: a) Order a very small quantity, and see how it sells (obviously I’ll be promoting the living daylights out of it anyway) and by small, I mean around 25 unitsb) Take a gamble and order a larger amount (i.e. 100 units) and hit the ground running with the stock?The benefits of a is that it’s a lower risk, but I could lose out on potential sales if it goes out of stock too quicklyObviously as I said, b is more of a gamble, however it also means that if it takes off in the way I would hope, that I won’t run out of stock as quickly.What are your thoughts? Play it safe, or take a risk? There is little doubt in my mind that it won’t sell, it’s just over what time period. see hubwealthy.com/wealthy