I Solemnly Swear... Black background shirt
I Solemnly Swear... Black background shirt
I Solemnly Swear... Black background shirt
I Solemnly Swear... Black background shirt
I Solemnly Swear... Black background shirt
I Solemnly Swear... Black background shirt

I Solemnly Swear... Black background shirt

Regular price $35.00
Unit price  per 
Shipping calculated at checkout.

Update 2022: yay, we have a new printer in the US! Shipping times for this product should be shorter now.

We are crazy about all things Harry Potter, so why not have this shirt ready to throw on for the next afternoon tea, gaming date with friends, or when binge-watching all the movies. Don't forget the magic color changing tea! 

Please note that the shirt will be shipped separately to your address, as they are made on-demand by the printer in the USA.


• 92% polyester, 8% spandex
• Fabric weight: 4.42 oz/yd² (150 g/m²)
• MaxDri moisture management & MicroBlok anti-microbial fabric
• Very soft four-way stretch sports mesh fabric
• Comfortable fit
• Overlock and coverstitch

Size guide

  XS S M L XL 2XL 3XL
Chest (inches) 33 ⅛ 34 ⅝ 36 ¼ 39 ⅜ 42 ½ 45 ⅝ 48 ⅞