The LITTLE 'GIRLS' TRIANGLE BRA is designed specifically for smaller body sizes and bust shapes...no under wire and no lining. The sewing pattern is available in Australian sizes 6-12A & 8-14B from my Etsy shop and is made from woven fabric cut on the bias, in this case a Liberty print called Tatum in aqua.
In order to make the bra you'll need to purchase three different types of elastic, sliders, rings, plus the back hook and eye closure. For supplies I've found a great resource in Bra Makers; an on-line retail store based in Ontario, Canada. They also have loads of patterns for larger bust sizes.
Apart from the instructions included with the pattern I've written three different HOW TO posts each with step by step instructions.