OK so I have never done this before and want to make this for DD
www.ravelry.com/patterns/library/seamless-flower-t-shirt
the flower is knitted in the round and there are some good instructions on the pattern to help with this, but do I really need 40,60,80 and 100 cm circular needles ? Not sure of the logistics of this method so I presume if the needle is too long the stitches won't fit round ?