You should be able to find a supplier that will do individual items.
As a club pbsbac used to hold stock of pre manufactured goods. The only trouble with that is you would need to hold at least 3 sizes of each item to ensure you had stuff in stock when requested. Also someone has to store and fund the items which can be a fair outlay. We spoke to our supplier (Funky Peach) who were happy to keep our details and allow individuals to order items on an adhock basis. The other benefit was that the members could pick any items of clothing on the suppliers books. We have embroidered club badge on the front with printed web address on the back this is a set format which members are not allowed to deviate from. The members can also add their own or boats name or whatever they wish with all costs born by them.
Benefits are no stock, no financial outlay, easy purchasing, adding personal information, larger choice of clothing items.
That said some suppliers will not do that, our work wear provider likes a minimum of 12 items or we have to pay a premium for the privilege of smaller quantities