How do i adapt a pattern from uk Double Knit to Chunky

[Goonerette]

Hi all,

I'm new to the site - really impressed ! I hope someone can advise me on this one...

I've been knitting for years and i class myself as intermidate level lol - my friends are all shocked that i can knit as i am in my 20's and it's not always seen as cool!

Ok, i want to adapt a pattern Double Knit Snowflake by Sidar to a Chunky Snowflake Sidar yarn. The pattern is for a funky baby hat - obviously can't post the pattern! How would you suggest i do this? Is it worth me knitting a gage in a smaller needle until i can match the pattern? It is currently reccommending a uk 8 / 4mm needle - should i start with a 3 3/4 needle ?

All advice would be welcome - i really want to use this yarn that i have been given and don't want to buy another pattern as i am sure this hat can work with the chunky version of snowflake.

Thanks

S-J xx