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