T-Shirt for a bachelor party, birthday, etc. Is your group planning a bachelor party? Then this would be perfect for the groom or the bride! And the rest of the party should also have one that says sidekick on it! They come in various T-shirts, sweatshirts, hoodies, etc. search sidekick at nerdshop.dk The hoodie is a simple and stylish classic hooded sweatshirt; it is a must-have for any hoodie lover. The fabric is a blend of 80% ringspun cotton and 20% polyester or 70% ringspun cotton (depending on color), 30% polyester, with a fabric weight of 280gsm.