Let us theorise it:

'Dichromatic' means: having or relating to two colours.
This could imply that the item will have at least two colours.

'October's end' means: 31 October which is coincidentally Halloween
This could imply the item relates to Halloween.

From this information, and the gift itself, one could assume that the item will be a purple and orange hat relating to Halloween.

The only item i could find on the unreleased items section of the Bopimo! Wiki is the Hallowed Hockey Mask, but this could be a cancelled item or for another event. I came to this conclusion as the item doesn't share the same colours with the present, which could indicate that they are not related.

Interested and want to share some of your ideas? Feel free to leaving them in the comment section.

most likely a totally new hat or a retexture with the colours

7 coins and a fully black top hat

pumpkin and gloomlight fused