You've made reference in past posts about Puerto Rico so thinking that is where you live...
With that, Amazon, Ebay are available to you as are all of the internet businesses you see written about here on the forum.
Being part of the United States Territories has some advantages, but shipping costs are what you need to watch for as sometimes as you know they can be expensive.
It is the weave of the fabric and heaviness of the material that makes clothing great for riding or not in coolness or warmth, longevity, look, comfort and support.
Personally I don't like tights and the super stretchy feel of them...also makes me sweat more and I find they just don't "breathe" as well as some breeches and cost about the same.
I also miss real or man-made "leather" patches as self-fabric just doesn't offer what I prefer in feel and grip.
If you are not buying tall boots then consider not buying breeches but jodphur pants as they are cut longer in the leg with better lower leg protection you would get from tall boots astride...there is a difference and your legs will know it when you get those first few "bites" on your inner calf exposed.
As large a selection nearly as breeches in many colors, shape & sizes and manufacturers...they might fit your needs better.
If you do breeches with paddock boots, consider half chaps...nice ones as they can allow you to wear the combination at beginner level shows acceptably outfitted and it allows you to wear any current clothes of jeans, sweats and such and still have lower leg protection from pinches.