The answer to your question is simple, we get clothing in clothing stores. If you want to dress Chassidic you can go to 51st Street corner New Utrecht Avenue in Boro Park, Brooklyn and you can get A-Z in Chassidic Garb from underwear to hat.
In my opinion, before clothing type, you would benifit with some guidance and help to feel who you really are, not who/what you want to appear as.
Perhaps you join/stop by a shul such as Emunas Yisroel on 16th Avenue between 44th and 43rd Streets in Boro Park Brooklyn. This shul is Chassidic and English speaking too. Ask for such as Rabbi Mordechai Finkleman or Rabbi Fishel Shechter and i’m sure, they as patient as the scholar Hillel was, will be able to help you or direct you. I am sure they can set you up for Shabbos by a family who will make you feel at home and comfortable.
Welcome back and Hatzlocha, Good Luck.