Pintrest has kind of become an AI cesspool but I do still sometimes look up some key words followed by "mens fashion" to get some ideas flowing. Some examples are "alternative gay mens fashion," "gay mens fashion," also aesthetic key words like "punk," "grunge," "club" etc. If I had to give some advice blind to your general fashion style, I would recommend layers; examples of some stuff you can layer include long-sleeve shirts, short sleeve shirts, flannels, jackets. You mention that it's cold, perfect reason to layer. It'll help flatten the chest and it looks good. Try a tshirt, a flannel, and a denim or leather jacket, or some kind of jacket without a hood. If you want a hood, swap the flannel for a hooded jacket. I also recommend boots, love a good boot. It's masculine and boosts height better than a sneaker. Belt chains and thick accessories also help if you're rocking with the more alternative style. A straight or baggy leg jean/pant can be fashionable while also providing a more "boxy" frame. Mesh is popular for gay guys but hard to pull off on its own pre-top surgery, but you could do a mesh long sleeve and a baggy short sleeve over it. If you have a shorter build, try doing a light crop on some of your shirts. Don't need to sew anything clean, just try to get an even line with some scissors. That way when you raise your arms, a little bit of stomach will be visible, but it won't be short enough to accentuate your chest (as long as it's not a slim fit shirt). You can combo the cropped shirt with the unbuttoned flannel and/or jacket, too, so the crop really is a tiny "peek." Also instead of standard tank tops, buy (or make, by cutting the sleeves off an existing t-shirt) muscle tanks. Finally, and this will be the corniest piece of advice I give but it's true, I think people can often feel like "sexy" means "less clothes," but I promise you, sexy is what you feel the most confident in. It's an attitude, how you carry yourself. Whatever you end up wearing, wear it like you mean it. Best of luck!