The question is... What woman are you trying to attract?
It honestly depends on your personal style and what exactly do you find is not attractive about it. However, in a general sense I will give you a few pointers to make your closet more woman friendly.
1. Say bye bye to BLAH: Keep a nice array of colors and patterns in your closet no girl likes a man with only black/white/brown.... add some reds, blues, yellows, and maybe even light pinks if your okay with that. With those colors add some stripes [horizontal and vertical] or maybe some graphics on your t-shirts. However, with that being said, don't go crazy with patterns and colors ie: Hawaii patterned shirts are a NO NO!
2. Shoes... a guys best friend: Keep your shoes clean and have a few pairs that provide selection, comfort, and style. Always have a pair of casual sneakers [not for active use] they provide simple style with easy comfort. Always have a pair of dress shoes in brown or black and keep then clean! CLEANLINESS IS KEY! On a short note, keep sock colors to a minimum of black, white, and brown. DO NOT wear white socks and black shoes... its an absolute no to many women.
3. Pants Please: Pants for men are pretty simple in the eyes of a woman. Jeans are a must and make sure they fit properly [size and length]. Do not wear jeans above your ankle. Not only do they look silly, but they make you look sloppy. If you like shorts.. GO FOR IT! Shorts are nice, casual, and come in a wide array of styles, colors, materials and such.
4. Accessories are not only for women: Watches, sunglasses, necklaces and chains. These are things that pertain more to your style and allow for a bold statement or the finishing touch to any outfit. I wont give much advice on this because you cant really go wrong with these simple items. Know what you like and wear it.
I really hope this helps. The key is to be yourself and show off your personal style. Women will like you for you and dont change just to please someone else... in the end its not worth it. If you have a personal style and would like me to give you a more personal clothing list and style please feel free to message me at anytime! I would love to help.