Some clothing is conforming and some is dynamic. You need Poser 5 and above to use the dynamic clothing. Most conforming clothing is conformed using the menu while some use body handles to tweak the fit. The morphs for V3 and Aiko purchased here probably require the head and body morph packs which are sold separately at DAZ. There is more than one version of Aiko 3. There is an LE version which is free and then a professional version with morphs and a fit for SP3 which is for sale at DAZ. There are basic tutorials here up at the tutorials link at the top of the page as well as over at DAZ. I suggest you also go to Poserfreebies.com and you will find some free figures for you to use in poser. Lilin 2 is a figure which uses V3 textures and clothing.