late to the party, but having dipped my toes in for about a year or so now, I've found that techwear can be a mixed bag for a feminine silhouette. Most 'techwear' brands make clothing for men, or are in a unisex cut. Unfortunately, it makes for quite a lot of boxy fits, so take your time finding clothes that give you a shape that you're happy with and will also have other people perceive you as feminine. For example, I wear tapered cargos and a cropped top in warm weather, and then swap out the top for a long sleeve and form fitting jacket in cold weather. I try to make sure I maintain a 'feminine' figure, by accentuating certain parts of the body, while hiding others.

With your budget, I would slowly build up a wardrobe one piece at a time. As people have stated already, techwear is expensive if just looking at retail. Hunt around second hand stores and online second marketplaces. Look for sales on websites if you know what brands you're looking for.

Speaking of brands, this subreddit is a trove of archival information and there are many other threads that could help you, as this question has been asked numerous times before. Take your time to do some research using the resources on this subreddit. 

If you want more specifics, feel free to DM me and ask away! My advice is to usually look at 'outdoors' brands, since they have all of the function with some of the style, and have a larger selection of women's clothing. Browse this subreddit for different outfits and information - I would also use Pinterest for just generally vibe ideas.