First off, congrats on the weight loss!!! You look so happy in that picture, I love it!
I was you. At my highest I didn't dress myself well at all. Just baggy clothes, pants, t-shirts and hoodies, that was about it! I started my blog to work on that and it's help me to understand my body better, figure out what works for me etc.
My first recommendation. Find a bra that fits well. I have a post
on buying bras while losing weight but my absolute biggest recommendation is make sure that your underbust (measured tightly)= your band size. Otherwise, you're not going to be getting the support you need. After that keep increasing your cup size until you find a bra that has a center gore flat against your sternum, your breasts are fully encloses by the cups and you don't have any quadraboob.
The reason bras are so important is because they can help prevent back pain, but also it lifts your breasts off of your stomach and elogates your torso.
As for clothes. Take your measurements! Learn your proportions and go from there. It's hard for me to see from your picture what type of body you have because the shirt is so baggy but typically the advice is to learn to accentuate the smallest parts of your body. My underbust is smaller than my waist so I try to find clothes that are fitted in my underbust rather than my natural waist or lower.
Also, start looking around and see what appeals to you. I've found that dresses work wonderfully on me. I have a very soft, flabby belly and pants often dig into that and give me a muffin top either that or they fall down because they're too baggy.
However, dresses don't do that so they're more flattering. Plus, I love the vintage look, especially 1950's dresses, flared skirts stuff like that so it's been fun for me to look at those too.
Mostly, be honest with yourself. What are your best features and which ones would you rather hide more? Then go from there. IF you have any more specific questions feel free to come back here and ask!