You should:
1. download the makehuman nightly build (see
http://www.makehumancommunity.org/wiki/ ... ownload%3F)
2. In this zip you will find makehuman, makehuman plugin for blender, makeclothes and makeskin
3. Download and install blender 2.82 if you don't have it already
4. Install and enable MPFB, makeclothes and makeskin in blender
5. In the settings part of MPFB load the settings for makeclothes
6. Import a character from MH
7. In the makeclothes panel click "extract" and pick the clothes helper group you think sound most like what you want. Probably "tights" in your case.
8. Change this mesh so it looks like what you want
9. Use makeskin to create a material
10. Check makeskin checkbox on the makecloths button.
11. Produce clothes.
We will not be able to tell you how to do general mesh modeling in blender. This require practise and blender know-how. Please refer to youtube tutorials for this.