Thank you for the opportunity to help you with your question!

Striped shirts = 19

Printed shirts = 58

Plain colored = 81

Given this as the only information at hand, Then the
question on how many more printed shirts than plain colored shirts the shop have
can be given as the Printed shirts minus plain shirts.

Thus = 58-81 = -23

Please let me know if you need any clarification. I'm always happy to answer your questions.