In terms of finances, thrifting is the way to go, especially considering that the height of emo/scene was just over a decade ago and so people are likely departing with their clothes now. Similarly, online second-hand stores like ebay will be good for you! Try to stay away from strictly emo/scene keywords as people tend to sell items targetted at emo people as more expensive.
In terms of judging parents, you can still look emo/scene with a toned down wardrobe. Try to get basics like black jeans/black shirts or colourful jeans with a cami top (for scene) since they arent insane clothing choices by any means. You can wear pretty much anything as long as your hair and accessories are classed as 'scene', yano?