Why don't you try some blue acid wash jeans instead of black? Black jeans tend to hide your shape. Also, do you prefer skinny jeans or something a bit looser?
In terms of t-shirts and tops, it depends on your size, your shape and what you feel comfortable showing. Some women dislike certain parts of themselves and want to avoid drawing attention to them, such as their shoulders, breasts, stomach, arms, etc. So definitely bare this in mind when shopping for new pieces. I think lighter coloured tops and more airy fabrics are a good way to go, especially in the current season. In autumn/winter, there are some nice feminine jumpers available that are pretty comfortable and you can get them in a 'roll neck' style, which can look feminine.
A good quality handbag is something that can make you look more feminine and is also practical, so I'd advise getting one. It doesn't necessarily have to be designer, though. Designer doesn't necessarily equal the best quality. You're paying for the brand, really. Black/brown handbags are good as you can pair them with lots of outfits.
Pinterest is a good site if you want to explore styles and see which you prefer. You can create a board and start to emulate which pieces go well together based on what you've seen.
I'd need to know a bit more about your preferences in order to give further suggestions.
Hope this helps.