open TDU modding tools 1.13, go to file Browser, then, go to avatar==> Clothes, then, Click on "COMMON_CLOTHES.BNK"
Here, select and extract "helmet_00.2db"
Convert this file in .dss with modding tools "2db==>DDS"
Then, open this file file with photoshop, modify it(you will need a nvidia plugin dss to open dss files).
You will also need a great pic of Ben spies helmet(you must also know that you can do only one side of the helmet, the other side will be replicate automaticly so forget HJC brand name at the middle of the helmet or somehting written behind the helmet like your name)
For the jacket , go to AVATAR==>Clothes==>REDRABBIT=>\M_MOTO_TOP_RED_RABBIT.BNK and extract \M_MOTO_TOP_DEFAULT.2db