To have/keep something up one’s sleeve is to keep an idea or trick secret until you need it at a later time, when it will surprise others and give you an advantage.
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POST MVP - Post Minimum Viable Product - T-Shirt
£14.50 – £21.00
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Do Something - 1970s Disco Style Men's Classic T-Shirt
£17.00 – £24.50
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Such A Chief - Fitted T-Shirt with 1970s style design
£24.00 – £28.00
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Mostly Good - 1970s design - Women's 100% Cotton Relaxed T-Shirt
£20.50 – £22.00
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Go Somewhere, Get Something - Unisex 100% Cotton t-shirt
£17.00 – £18.50