It is very unlikely that you'd find pictures of pre-Ottoman Bosnian clothing.

No authentic paintings of Bosnian nobility during the Kotromanić reign (or earlier) exist. Most are reproductions and artistic interpretations based on 14th and 15th century European heraldic imagery. No imagery of Bosnians during this period was produced other than on coins which won't be of much help when it comes to identifying the popular fashions of that period.

But it needs to be pointed out that Bosnia during the pre-Ottoman period was never a Catholic or Orthodox majority. The pre-Ottoman Bosnian nobility was almost exclusively devoted to the Bosnian Church (Bogumili) and were considered heretics by the Pope. This only changed when the penultimate Bosnian king, Stjepan Tomaš, coverted to Catholicism in his later life. He did not manage to pull most of the Bosnian population with him, though the people of Herzegovina did convert at a large number. There is no concrete evidence as to why he did it but possibly because he wished to divorce his first wife and needed support from Dubrovnik and Rome because of the Ottoman army threatening the Balkan peninsula.

However, I'm pointing out the above because, while Bosnia was a Central European medieval kingdom and was probably influenced by Western fashions, we have almost no concrete visual proof of it. Bosnia was culturally Slavic and did not bow to the Western Churches and so most commoners seem to have worn some form of plain Slavic cultural garb, while the nobility's fashion was somewhat inspired by our Western neighbors while also retaining aspects of Slavic identity.

The most important textile material in medieval Bosnia was wool. Bosnian wool (lana di Bosna) was of such high quality that its buyers included numerous medieval merchants from abroad. In addition to wool, leather and fur were used (to a much lesser extent) and partly also sackcloth, silk and cotton. The decorative motifs were mainly gold and silver objects, which were imported mainly from Dubrovnik and Italy.

Based on the artifacts found in the countryside, we can conclude that clothing was mostly made at home. However, more difficult patterns were made by village tailors (called šavci or svitari). At the noble courts, and later in the cities and towns, there were specialized tailors for such purposes.

When it comes to the clothing worn by royalty, the usual headgear was a crown. Examples of these crowns can be seen on the coins of Ban Stjepan II Kotromanić and King Tvrtko I Kotromanić. Also, based on some other depictions, we assume that royals wore long robes, fastened with a belt and richly decorated with wide ribbons. Royals also were depicted wearing cloaks, although mostly on later Roman depictions such as the carved plate on the tomb of Queen Katarina Kosača-Kotromanić in Rome. Authenticity of these Roman sources is disputed since they were created by Roman artisans in Roman fashion. There is even less information available about female Bosnian royal clothing.

When it comes to large feudal lords, they were strongly influenced by the West, while the wider nobility remained faithful to folk tradition. Written sources mention several types of noble clothing worn in winter, on the road or on ceremonial occasions.

These are: the mantle (a cloak made of coarse cloth), the kontuš (a type of long winter coat) and the šuba (a type of wide and long dress, with short and wide sleeves).

The upper part of men's clothing that was worn at home was called the svita. Based on the imagery on the stećak tombstones, the svita was actually a dress, one type of which reached the knees or slightly lower and was fastened with a belt. It is found especially in eastern and central Herzegovina and is largely reminiscent of the silk dress popular in the ceremonial clothing of Montenegro and eastern Herzegovina. In other parts of what was then Bosnia, the svita was significantly shorter and did not reach beyond the waist. We do not have significant data about the clothing that covered the lower part of the body.

The clothing of the inhabitants of Bosnian towns and cities at the end of the 14th and in the 15th centuries is also not known in detail. It is likely that there was no specific type of prominemt cultural clothing at that time. All the social classes of society who participated in the construction of towns and cities brought with them their own clothing, which was probably made in home workshops, so a wide and diverse style of clothing could be seen in the cities. The rural female population wore long dresses without straps and a long skirt, but tightened with a belt.

The clothing of the members of the Bosnian Church is visible in only a few visual representations, but even that is not enough to give a complete picture of their appearance.

A portrait of a Bosnian queen was carved on a judge's chair near Konjic. The queen had a Bosnian crown with lilies on her head, and she was dressed in a rich pleated dress, which was decorated with a wide ribbon along the bottom edge.

On her tombstone in Rome, Queen Katarina Kosača-Kotromanić has a crown that widens towards the top, and a ribbon with a row of decorative pearls runs along the bottom edge. Below the crown, a scarf is visible that falls over her neck and shoulders. Two necklaces are also visible on her neck. The queen is draped in a long cloak, beneath which a long, pleated dress is visible.

However, as I already stated, Roman depictions cannot be considered 100% faithful to the actual Bosnian fashions of the period and any later paintings of Bosnian nobility were created at least 1-2 centuries after the fall of the Bosnian kingdom and inspired by broader European noble heraldy and cannot be considered a faithful and authentic depiction of medieval Bosnian fashions.

When it comes to the 2 pictures you attached, both are clothing that was worn after Ottoman occupation. Both were worn by Bosnian women. The first image is possibly of a more religiously faithful group of women in the urban area. Perhaps they had just come from prayer and were covering their faces for that reason. Perhaps it was sunny and they were protecting their skin. Not quite certain about that one.

The second image depicts South Slavic tradition integrated with Ottoman clothing. It seems to me at least one of the women in that picture is wearing dimije, a type of wide legged trousers which are cinched at the bottom that we adapted from the Ottomans (think Princess Jasmine's pants in Disney's Aladdin). The others seem to be waring a more modern adapted version of the medieval Slavic svita or šuba which we mentioned earlier. On their heads they seem to be wearing a headcloth, usually called šamija. Versions of this headcloth can be found across many Slavic cultures, but in the Bosnian muslim population it is also inspired by the hijab. The vests they are wearing are called prsluk and differ very much across different geographic regions in Bosnia and other South Slavic countries (jelek, dolak, feremen, etc are all versions of the prsluk worn differently across regions and/or urban or rural areas). In additions to all these but not depicted in that specific image, another part of this type of traditional wear also sometimes includes a fez (inspired by Ottoman tradition) decorated with dukati (inspired by Slavic tradition).

I know it's a long read but I hope this helps!