Thank you for the inquiry, from what we gather from the question you were asking about HIV transmission by vaginal fluid passing through clothing, as well as the probability of a false negative test result. From the information given, this scenario is determined to be No risk (Transmission of HIV is not possible in the given scenario).
The scenario mentioned above does not meet the three components of the transmission equation. Assuming that there were vaginal fluids present, the activity explained would not give the virus direct access to your bloodstream. The OneStep home test that you did is accurate up to 98% after three months if the test was preformed properly (1). Home tests can be good preliminary tests, however for more conclusive results we recommend a consulting your physician. Your physician may be able to offer a fourth generation test which is more accurate for a recent HIV infection. The OneStep test is a blood-based test which can have more accurate results in comparison to oral-fluid home tests. However, in general blood-based tests have shown to have more user errors associated with them and therefore more false-negatives (2). This is just educational, as stated above your scenario was No Risk.
Recommendation: No need for HIV test with the scenario provided, refer to a healthcare professional for other health related questions
AIDS Vancouver Helpline/Online, Rashell
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1.) OneStep Accuracy
2.) Accuracy of Self-Testing for HIV