How to make the make up layer over skin overlays.How to change age and gender flags in s4pe by CmarNYC.Create your own seamless patterns in Photoshop.Seamless pattern tutorial for Photoshop on YouTube by RockChick/Neen.Photoshop recoloring tutorial by JSBoutique.Simple Retexturing for the Sims 4 by PlatinumSimmers.Beginner's Tutorial - Custom Recolor and T-Shirt Design by StarryNiteSims.Video Tutorial: Making Custom Textures for Sims 4 Clothing using Photoshop by brujah236 on YouTube.Multi-channel image editing (RLES, shadows etc) with and friends.Video Tutorial: Making Custom Textures for Sims 4 Clothing using by brujah236 on YouTube.Introducing shine in Sims 4 clothing by editing specular images with GIMP 2.8.16.Video Tutorial: Making Custom Textures for Sims 4 Clothing using GIMP by brujah236 on YouTube.Convert a TS3 Dress to TS4 using CAS Tools, Milkshape and GIMP.Editing CASP Flags with TS4 CASTools (nyloa on tumblr).TS4 CASTools: Flag edits | Gender, randomness, categories, etc (plasticbox).Making Custom content Using CASTER by Zerbu.Blender mapping 4 of 4 by Darrin Lile - You Tube video.Blender mapping 3 of 4 by Darrin Lile - You Tube video.Blender mapping 2 of 4 by Darrin Lile - You Tube video.Blender mapping 1 of 4 by Darrin Lile - You Tube video.The new mesh vertexes will pick up the vertex weights based on it's proximity to vertexes in the active game mesh you selected, even if the vertexes have different weights. (Older Sims versions called them Bone Assignments.) It's way easier than the old bone assignments in Milkshape because instead of configuring each vertex by itself, you select the game piece, then your 'new mesh' piece and transfer the vertex weights all at once. Weight Transfer in Blender by Brujah at S4S This is how you transfer (copy) vertex weight values from game meshes to your new mesh parts in Blender.SEB's Comprehensive Clothing Guide by llazyneiph.A few Blender tips for CAS items by llazyneiph at Tumblr.Converting an Accessory's Look to Glass by untraditionalnerd at S4S.2 Video Tutorials: Standalone Accessory Recolor with Multiple Swatches by brujah236.Sims 4 Studio Video Tutorial: New Earring Accessory - Mesh by brujah236.Using Sims 4 Studio to Add a Custom Accessory.It has important meshing and blender UV mapping info that applies to any mesh creation. Start to Finish Accessory Mesh Tutorial for Beginners By orangemittens at S4S This is a 5 star beginner tutorial.
8.2 Tutorials from Sims 2 and Sims 3 that may help.