Do you remember when I shared this Daffodil Delight card? Well it was my attempt at a slimline card (my version was 17.5cm x 10cm) and I didn't have an envelope for it. Since I made the card, it has been sitting on the side of my desk waiting for an envelope. I finally got around to making one and used some old DSP as it matched the card perfectly.
I have included a diagram of my envelope sketch. As you can see, I begun with a piece of 23cm x 23.5cm DSP and scored it at 5.5cm and 16.5cm and rotated it 90 degrees and scored it at 2.5cm and 21cm. I then did angle cuts (as shown in red) and cut away the pink areas.
I am happy I now have an envelope for my emoji birthday card and a sketch for reference for when I make another card/envelope this size again. Hopefully, this helps you if you make a card this size as well.

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