Does gynecomastia surgery make a big difference in how clothes fit?

I'm looking into gynecomastia surgery, but I'm really self-conscious about my chest line when wearing thin t-shirts.

I can't tell if I've just gained weight or if I have gynecomastia, so I think I need to get an examination first.

If I have gynecomastia surgery, will the bulging feeling definitely decrease when I wear a t-shirt?

I'm also curious about the pain and the realistic duration of wearing compression garments. ㅠㅠ

Those of you who have had gynecomastia surgery, please let me know about your satisfaction level and how the recovery process went.