Personalized Trombone Halloween Cobwebs Youth T-Shirt. Trombone in cobweb text with the image of a trombone covered in cobwebs is a humorous Halloween gift design for low brass musicians, school music teachers and students in concert and marching band. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.