When you use the store link on the top of the page it’ll bring you to our square store, which has our stickers and such on it. Through that you can use the Stream Elements link for apparel items.
Why have 2 store? Firstly, I’m not able to bare the costs of having custom t-shirts made for everyone. SE merch is perfect for it. You can pick the color and size you want and they send it right you. It still supports us as we get a small cut from the sale.
Secondly, for small stuff such as stickers and pins I like to keep around for not only the square store but also for giveaways.