I'm not out for my parents, and I'm a minor, so I can't get a binder. The other binding methods don't appeal to me and a regular sports bra won't help with my breast size.
So.. Yea. The main clothing items that come to mind are hoodies and sweaters. Both are really common where I live, I swear every boy wears a hoodie like 24/7, so that's no problem.
It's rather cheap too, way cheaper than my clothing options would be if I had a binder. I'm also loosing weight and no one minds baggy hoodies or sweaters, compared to a baggy dress shirt or baggy blazer.
button up shirts can be good. also tshirts with patterns and designs to distract people's eyes from your chest.
edit: i realize those arent really 'baggy' suggestions but i can't think of anything baggy (besides hoodies which you had already mentioned) but you could always get them a size or so bigger
i bind most of the time but when i dont ill wear a tighter t-shirt, a loser t-shirt and a hoodie on top. i really dont leave the house without my binder.if you want to you can get a binder. you can buy a visa gift card at the super market or convenient store. which you can use online to purchase a binder.
I've only been out to my parents for about 7-8 weeks, and I'll be a minor for a few years yet. For most of my teenage life, I'v worn a zip-up hoodie every day, even in the summer (except for this year -our summers usually get up to 105 F, this year it was 117 F). I actually had a friend of mine get me a binder for my birthday one year. She ordered it and had it shipped to her house, then slipped it into my backpack the next school day. I was parnoid about my parents noticing, but the hoodie also helped hide that they were flatter than usual.
I found that zip-up hoodies are better at hiding the lumps than pullover ones. Also, I would wear a sports bra that's one size smaller than what I'd need. I couldn't go with no kind of bra, because then the stuff would move around and make themselves obvious. A regular bra, even those with no wire or padding, wouldn't hide them. I can't give any tips to large-chested individuals, though, because I'm a size 32B, but I'm only a B because the lumps are wide - if it weren't for that, I'd be an A because they're kind of flattened, which is partially due to only ever wearing somewhat tight sportsbras.
I never had any luck with button-up shirts because my mother would go on a rampage to make sure that said shirts didn't make me look like a boy. I found that general t-shirts were the best, preferably one size too big. The Fossil brand men's shirts were the best. They're the somewhat unisex-type men's shirts, so they didn't raise any suspicion and they have clever designs on them (at least, I think they do!). One of the shirts I got from there, I could pass in when even wearing a regular bra! :)
So, I hope that helps somewhat. Sorry, I'm not very good at giving tips. :(
Agreed on the button-up shirts.
Make sure you buy shirts with designs all over them and not just focused in the center on your chest like girl-shirts. Obviously, words on your boobs will make people stare at them more.
And don't wear white shirts, this will make your chest look bigger.
You can also layer your shirts a lot and this will help make your sides look a little wider and will definitely help out.
Try drawing attention away from your torso by wearing accessories on other places; hats, watches, cuff bracelets. Stay away from necklaces or scarves that hang over your chest.
Good luck!